Asked you about th400 oil pump whine few months back, you suggested to use a metal screen filter. I replaced the alto filter with wix 558890 allison metal screen filter. The whine is gone now! Thanks for your help and keep the good videos coming 👍
I used this video and a few of your others to build my first TH400. Its reverse manual VB, Tbrake, and the thing is an absolute animal!! Behind a turbo LS. Only been driving it a month and a half but the thing is doing great! Thank you so much for putting good, tried and true info out there.
@@mountainsgarage can you pleeease do a segment on plumbing/wiring?? Where you like to read temp sensor from, the resistor/spike when Tbrake is released, what solid state relay you recommend, that sort of thing. My stuff is working but I had to scour the internet to find those things. And a trans builder will probably know whats best, maybe I did it all wrong lol
@@batdad187I know I'm late but did you change to a 36 elmater sprag super drum, deeper pan, 6 clutch drive, 5 clutch foward , 4 clutch intermediate, bullit input shaft ECT ?. Your response will help a lot .
@@god1st.530 all good, car isn't going anywhere and trans is still working great. Full season of racing/street under its belt now. Yes on 36 sprag, did the 4l80 drum, yes on deep pan, couldn't clear 4 intermediate with the clutches/steels I had but its been fine. Its still stock shafts, just followed the recipe in the vids.
Just got my trans installed in my 9 second camaro. I used your 1000 hp formula and the thing works beautifully. I used all coan parts and transbrake with a TCI 4500 stall tightened up for nitrous use. I was worried sick the trans wouldn’t work right and it works better than expected. I can’t thank you enough for the questions you answered and the time you took to get me through it. I’m confident enough now to do my own race 400s. This is an extreme confidant builder. Thanks again.
I use the switch pitch turbo 400 correctly called the variable stator converter in the turbo 400. It is an electric activated stall converter and electric controlled shift. Not to be confused with the electric lock up converter. Two completely different animals. Easily carries my 600 hp big block Buick engine in the Binderbird.
Just love your th400 vids have beening running one in a dragster for 20+years mostly stock but zipper it bad when we stepped the hp up to 1600 now building one a bit stronger so I love your channel parts are hard to find and dear here in OZ as we have to import most parts from the US Cheers from Downunder
I remember years ago an ol' timer saying that he machined the case for strength. I can't find anything to that effect online. I wish that I would have paid more attention to what he meant. Subbed to your channel. Very interesting. Thank you.
i worked for a transmission remanufacturer in the parts dept they wont miss 1 clutch or steel x 100,s over the years & a dumpster full of parts from the builders
Been working my way through a ton of your videos for my first th400 build, I have a 4l80e I'm stripping parts out of. I'm swapping in the direct drum and forward hub. Is there anything else I should be swapping for any advantage seeing as I have all the parts available? Also putting in a tci full manual reverse valve body. And I just wanted to say I really appreciate all your videos the have been a ton of help!
i been getting the 02xx 400r turbo for free it is good to 800 hp stock so far i have got 4 crate setups for free with the 450 hp 454 with the 02xx trans from 6,000 to 58,000 miles on them the trans come with the 8 bolt pump heavy clutches stage one shift kit with a few extra the engine come with steel crank heavy rods high flow heads 10.5 to 1 compression just needs to breath with a bigger carb and a good intake it come alive . i put one setup in my 68 pu and the trans works great not quit as good as my pro built 400 turbo which is good to 2000 hp but way better then any standard 400 turbo
I love my th400. I know its heavier than a th350 but it really makes my car feel alot faster. With the th350 I couldn't chirp the tires but with the th400 I can either drive like a grandpa or shred the tires on command. So far I have just been careful on the fwy I have 3.42 gear and it wilk not downshift at fwy speeds. People tell me I can do it but I broke 3 intermediate sprags so I am a bit overly cautious.
the 400 has a lower first gear then a 350 what u really want is a 02xx 400r turbo stock they are good to 800 hp night and day different to a standard 400 turbo . i been getting them for free u can get them out of motor homes and heavy trucks they will have 02xx welded on the bell housing gm sells them as a street strip or heavy applications
@@SubePelayo928 no it is a crate trans like a crate engine trans combo they are good to 800 hp heavy 8 bolt pump heavy clutches stage 1 shift kit that is how they come stock but it saves a lot if u want to build it to 2000 hp trans
Love the video! I am not worried so much about hp level but what are your thoughts on making a th400 with auto shifting as aggressive as you can. I have seen the mild th400 videos. how about an aggressive th400 auto shifting street build. Thanks for all your hard work
It sounds like dual feeding the direct clutch wouldn’t help me much but I’ve heard you briefly mention dual feeding the forward clutch. Is there any other modifications needed other than leaving the seal out? And can that be done and run with a stock valve body? Also if you ever need any 2wd output shafts or tail housings i have a bunch of them. I’m always in the market for 4wd output shafts
I don’t know if there’s much demand for it but I was wondering if you’d be willing to make a video on what to do for something that’s even more mild 500 hp and 600 foot pounds of torque auto shift? Thank you
Do you need a manual valve body for this ? Or can you just add a shift kit and shift manually? Also can I use the stock springs or should I upgrade to stiffer springs ?
shawn you mentioned that the forward hub is a good idea. how crucial is the upgrade is it vs a nicety? is it just towards this power level that it becomes a good choice? what happens with failure? i have all the tools i think ill need. -Trans case holder for engine stand -pucks of various sizes that can be used to press bearings -clutch depresser tool -big hose clamp for pump -dial indicator + base -sockets, snap ring pliers, picks and various hand tools -green assembly goo -3l80e astg book i also grabbed a supposedly still good th375 for a $150. if the steels/clutches/etc look fine ill reuse them. -used 9.25" truck output yoke and new tail housing -sfi housing -transgo hd intermediate snap ring -direct clutch drum + 34e sprag (assume 4l80e since it lists for both th400 + 4l80e) -case saver -roller bearing + shims just need to pick a transbrake, both atd and jakes are on backorder. probably go for a jegs/summit kit thoughts? missing anything? thanks for sharing! youre an inspiration!
Hey shawn, is there a particular complete "rebuild kit" that you can reccomend for a stock th400? I've heard alot that waffle style clutches and tan clutches are a good choice. Looking to buy something that takes the guess work out of piecing together what I need
I have a th400 trans from a RV that was bolted to a 454 big block engine with 80k miles. What are some things I would you recommend doing to it or just rebuild it back to stock I'm bolting it to a 5.3 ls engine for the street no racing. Rebuild it with a new converter .
Hey. Just ran across your videos while searching for th400 rebuild. I build a bunch of rock crawlers with LS motors and 400 transmissions. Decided to start rebuilding them myself. In the past I’ve had them apart to swap 2wd to 4wd output shafts but never been into the drums or pistons. All the videos I see are usually for street cars but I hardly ever use 3rd gear. Mostly just 1st, 2nd and reverse. Usually have to run them way over filled with fluid because of standing the vehicle straight up and down. Also sometimes have to grab reverse under throttle to prevent flipping over backwards. Have any build recommendations for something like that?
Interesting! You might want to check out the Demo Derby type mods online. As far as the oil sump I don’t know if anyone makes a swinging pickup in a extra deep pan? I didn’t have much to offer here, but if I can help in the future just ask!
Got my case in the local parts washer after your case prep mods. Ive got a couple quick questions that would result in having to order a few more parts. For a th400 that will get hammered on by small ls truck engines, should I do the case saver and spiroloc ring? I'm just cheap and like to have fun. Next is there a pro and con of the spiroloc you showed during the case saver part vs a thicker snap ring? Or is it more of playing with clerances thing? Last one of the night. I know you turn down the o ring and bevel on the output shaft, you have a lath right there. If one had to pay someone to do that would it be better to just remove the o ring and buy one of the beveled sunnex yokes in 1310 or 1350? Killer video again. Im loving the th400 vids, definetly building my confidence to just do it. I owe you some beers or a clean down south core the next time I'm up in Maine.
If you are keeping the front band then a thick snap ring or a spiral lock snap ring, your choice both work fine. You can run a counter bored yoke. I cut the shaft because its easy, cheap, and any yoke will be happy. Thanks for watching, always glad to help!
@@mountainsgarage last round of questions on this topic. Is there a make/model or part number for the thick snap ring or spiral loc you recomend? On a different note, if keeping both bands, not running a trans brake, but plan on beating on the engine and trans hard can you run a case saver? Would you recommend that?
You got the best videos on the th400...im building one for my drag week car.. other then the pump mod on one of your videos Do you know how to make the pump live on the street with a trans brake ? I hear it's kills them in a few thousand miles ..
I will have to side with the majority that doesn’t see TH400 front pumps wearing out very often. I know it was a subject for a while but can’t find much real evidence. Thanks for watching!
Been watching your videos for awhile now and I’m currently building a TH400 with transbrake but I built the transmission off a video that was removed from TH-cam but i used a reverse manual valve body and cut out the correct passages and blocked off one channel I bought the correct spool for the selector, separator plate and gaskets, and external modulator valve for trans brake but my issue now is in the video the guy removed two spring valve assemblies that were next to each other and put 1in freeze plugs in them but the holes are not big enough for that so would I be ok to leave the shift kit parts in the valve body or can I find a different plug to block off the ports? I’ve done extensive research on it and keep coming up with nothing and you are very knowledgeable about th400 and seem to know what works and what don’t any advice whatsoever is appreciated thanks!!!
Quick question buddy if you’re doing a 400 with a 400-3 Transco shift kit can I leave the inter seal in the direct drum out and including the second ring from the top on the center support
Hello Shawn, I follow all your videos and very much appreciate all the help you have provided to prepare me to build my TH400. I have the Hipster engine braking valve body and BTE bellhousing already and just looking for an overhaul kit for clutches gaskets etc. I would like 5/5/4 clutches, do you have any opinions on a good complete kit rather than trying to price something together? I realize I will still need a few additional goodies such as case saver etc. The goal is to be safe to about 800hp and I am looking at the FTI F4019-4 kit right now. Any insight would be appreciated. Rob
Any good performance trans shop can probably piece you together the neeed parts. No kits likely exist mixing the 4 clutch 4L80E intermediate clutch’s, steels, and pressure plate.
how long will a pump last with a trans brake? I read somewhere that the transbrake is very hard on the pump will it last 50 passes will it last through a week at rocky mountain race week....what's you take on the situation......thanks love your videos
All performance transmissions benefit from an increase of 20-30 PSI over stock, transbrake or not. We are only talking about a regulated 200psi. Most hydraulic pumps make thousands of PSI. I have never seen any increased wear. Most transmission builders will agree, no issues.
I'm wanting to delete the vacuum modulator and remove the governor on my street strip th400 while using the stock valve body what mods are needed to accomplish this? Thanks
I have seen some advertised claiming they will handle almost that, personally I think it’s going to let you down after a large investment trying to make it do something it can’t. If you really need overdrive then 4L80E is awesome. I would take a 2004R over a 700R4 but both are weak by comparison.
I just put 1 of those exact models in my 73 Camaro. I love it but wish it didn't shift so hard 1st to 2nd. Maybe it will last longer that way. Let me know if there is an easy way to soften the 1-2 shift a little. 600 HP 434 dart engine.
Hey what’s the part number for the intermediate spiral lock. The larger one you show next to the case saver is upside down and I don’t believe you mentioned it.
thank you for this video. I was wondering if I'm able to do these upgrades without going valve body? i don't plan on racing but i want a reliable long lasting th400. and if adding a case saver to a non valve body trans is fine? thank you.
In the video, you mentioned something about a "vent fitting" and "cooler lines." I assume the cooler lines are a reference for a trans cooler correct? As for the vent fitting, I'm not sure if you're referring to an overflow tank, dump valve or something else
Can you explain how important it is to start a burnout in 2nd. I never got that. I think I hurt one shifting 1st to 2nd at 6000 with sticky tires. Not spinning. 600 HP. If it hurts these trannys that easy isn't a beefed up T350 better?
If it’s manual start in second, shift to high and roll out towards the line. I guess you are saying it’s not full manual, so go 1,2,3 quickly and don’t let it hook in second.
I'm in the uk and trying to build a th400 for my 1000hp nissan 300zx and need help sourcing the parts I will need etc. I was hoping this would be something you could help with ? That's assuming you ship to the UK.
Now would this be acceptable for a dyno tested 510hp, or will I be better off leaving it as is, I got to fix reverse any way so I figured wile I got it apart will it hurt to do this?
any suggestions for building something like this cheap. I know 1000hp and cheap shouldn't be in the same sentence. But it would be cool to see something someone who doesn't have a bunch of extra cash could build.
Do you have a 1200hp - 1500hp formula you could share with us as I am looking to moving from 1100hp glide to a 1200hp -1500hp TH400 as motor now making 1400 at the flexplate.
I have a question for you. I have a turbo 400 in my car runs 980s at 137. The car works great except for when we go to push it out of the trailer. It does not want to backup. Worth of shit goes forward. Fine pushing it. I just had it serviced new clutches and stuff and it still won't push backwards worth of crap pull the driveline out. The car pushes backwards like nothing. Have any ideas?
Hello friend, I saw your video and I would like to get a question right, I took my th400 transmission to be repaired but it did not make the third change, I already changed the governor, modular, converter, and it continues the same, now to your great experience what will be the problem for which Does the third change not make the transmission? please help
Hey Mountain Garage. iv'e got an early TH400 i picked up and had been sitting outside and may have taken in some H20. I think i heard you say if one takes in water it's not worth overhaul, should i open it up and see how bad it may be? What do you think ?
I did a few videos last summer on stripping three Pontiac HD TH400’s that were full of water. I saved a lot of parts and was able to soak the rusty stuff in rust remover and save more. Definitely rip into it and see. I have three more of the HD Pontiacs to see what is inside. Merry Christmas!
How much do you charge to have a th400 rebuilt if you are rebuilding at the moment? I would love to have my transmission rebuilt by someone who has a passion for transmissions
Hello. So im on final assembly and had a question. So i pretty much followed your instructions to a tee but im going with the auto shifting vb with the mods you suggested. Question...Should i run the engine braking band? Also is there any mod to do to the rear accumulator for the reverse band?
@@mountainsgarage So leaving it out with auto shifting wont cause issues with the sprag down the road? Also, if leaving it out are you plugging the case hole or just installing the accumulator piston in the case?
hey man is the ROSSLER TH400 XHD WITH 210 first, 1.4 second and 1.1 Third good? also what stall would you recommend for a 1000hp wheel hellcat, running a 50 tall tire, 4800 race weight
If it’s in good shape I wouldn’t worry too much if it’s a light vehicle. They are pretty stout. You could put a shift kit and a race filter while it’s in the car.
What clutch pack would you use for 1100 hp. I was going to use alto power packs with all the mods and a coan transbrake. Can’t find anyone who has them in stock. What would be the best alternative.
@@mountainsgarage one more question if you don’t mind. What should the Stack height be for the forward clutch’s and steels. Also the normal thickness for the plate on the forward clutch hub drive. I was trying to determine if it had been cut. Thankyou very much. Love your channel
They held up fine in 4-500 HP cars when they were new. But that was a long time ago, like 50+ years, last TH400 was 30 years ago. It all comes down to HP, Weight, and Traction if the transmission is in perfect shape. Add in condition to that equation if it is indeed bone stock.
There are local guys well over 1000hp with stock shafts. Weight and traction are also a factor. The inputs come with a larger spline in a stock drum, main shaft is an easy swap. The output is probably the last to worry about, but when someone wants to upgrade I do all three.
Everything he said plus aftermarket Reid case and bellhousing, NASA billet shafts, NASA rear and front drums, billet valve body, billet yoke, maybe even a billet pump...etc. So I've been told,maybe I'm wrong. If you find out differently let me know?
Hi Shawn, I'm in northern NY and I'd like to have a 400 built by you. I'm getting my hands on one soon. How do I contact you for a quote of this build? Running ~600 but want room to grow
Thank you. Internal. I dropped the pan and pushed it in and out multiple times and it seems smooth. It works more often than not. I could here it click on the release but it wasn't engaging. I can get a new one. I just wanted to pick your brain to make sure I hadn't missed anything internally that could cause the intermittent issue. I followed your videos to do my build. Thank you for the great videos.
The kit that contains the intermediate case spiral lock and the direct clutch sprag spiral lock came from Feiock Performance on eBay, part number FP400SLK. I see other manufacturers use their own part numbers. I searched TH400 spiral locks.
Great video. And I'm leaving a comment from now on so you can make more money, Shawn . Google makes enough money and needs to share with those that got them there, right? This isn't college sports where the guys making the money don't get paid.
Asked you about th400 oil pump whine few months back, you suggested to use a metal screen filter. I replaced the alto filter with wix 558890 allison metal screen filter. The whine is gone now! Thanks for your help and keep the good videos coming 👍
Great! Thanks for watching!
That's a great tip if you have any decent horses or if you live where it's super cold.
I used this video and a few of your others to build my first TH400. Its reverse manual VB, Tbrake, and the thing is an absolute animal!! Behind a turbo LS. Only been driving it a month and a half but the thing is doing great! Thank you so much for putting good, tried and true info out there.
Glad to help!
@@mountainsgarage can you pleeease do a segment on plumbing/wiring?? Where you like to read temp sensor from, the resistor/spike when Tbrake is released, what solid state relay you recommend, that sort of thing. My stuff is working but I had to scour the internet to find those things. And a trans builder will probably know whats best, maybe I did it all wrong lol
@@batdad187I know I'm late but did you change to a 36 elmater sprag super drum, deeper pan, 6 clutch drive, 5 clutch foward , 4 clutch intermediate, bullit input shaft ECT ?. Your response will help a lot .
@@god1st.530 all good, car isn't going anywhere and trans is still working great. Full season of racing/street under its belt now. Yes on 36 sprag, did the 4l80 drum, yes on deep pan, couldn't clear 4 intermediate with the clutches/steels I had but its been fine. Its still stock shafts, just followed the recipe in the vids.
Just got my trans installed in my 9 second camaro. I used your 1000 hp formula and the thing works beautifully. I used all coan parts and transbrake with a TCI 4500 stall tightened up for nitrous use. I was worried sick the trans wouldn’t work right and it works better than expected. I can’t thank you enough for the questions you answered and the time you took to get me through it. I’m confident enough now to do my own race 400s. This is an extreme confidant builder. Thanks again.
Awesome! Glad to help in a small way, but you did it! Nice work!!
Built my th400 with the help of your vids. Couldnt be happier with it.
As always, outstanding information Mr Mountain and thank you kindly for the great advice and tips!!!
I use the switch pitch turbo 400 correctly called the variable stator converter in the turbo 400. It is an electric activated stall converter and electric controlled shift. Not to be confused with the electric lock up converter. Two completely different animals. Easily carries my 600 hp big block Buick engine in the Binderbird.
great video, lots of things to consider.
thanks Shawn.
Just love your th400 vids have beening running one in a dragster for 20+years mostly stock but zipper it bad when we stepped the hp up to 1600 now building one a bit stronger so I love your channel parts are hard to find and dear here in OZ as we have to import most parts from the US Cheers from Downunder
Awesome! Thanks for watching!
Can be more plain than that! I've learned a lot by watching your channel. Thank you!
You information is awesome mate. Thank you for your time and knowledge
Thanks for watching!
too much info for the layman how can i make any money let them buy jigs &presses and 1000.s in speciality tools +books good vid shawn
I remember years ago an ol' timer saying that he machined the case for strength. I can't find anything to that effect online. I wish that I would have paid more attention to what he meant. Subbed to your channel. Very interesting. Thank you.
Good video, excellent communication skills
Video is on point. Awesome man
Thank you for sharing your information.
Appreciate you watching!!
By the sounds of it, your an epping guy.. great vid!
Yes sir! Thanks!!
Love your channel brother. Ty. Can you show how to file/flatten a case with a wet stone? What grit etc?
Great video man
i worked for a transmission remanufacturer in the parts dept they wont miss 1 clutch or steel x 100,s over the years & a dumpster full of parts from the builders
Your videos are amazing! Can you recommend a quality rebuild kit?
Been working my way through a ton of your videos for my first th400 build, I have a 4l80e I'm stripping parts out of. I'm swapping in the direct drum and forward hub. Is there anything else I should be swapping for any advantage seeing as I have all the parts available? Also putting in a tci full manual reverse valve body.
And I just wanted to say I really appreciate all your videos the have been a ton of help!
i been getting the 02xx 400r turbo for free it is good to 800 hp stock so far i have got 4 crate setups for free with the 450 hp 454 with the 02xx trans from 6,000 to 58,000 miles on them the trans come with the 8 bolt pump heavy clutches stage one shift kit with a few extra the engine come with steel crank heavy rods high flow heads 10.5 to 1 compression just needs to breath with a bigger carb and a good intake it come alive . i put one setup in my 68 pu and the trans works great not quit as good as my pro built 400 turbo which is good to 2000 hp but way better then any standard 400 turbo
Whit Sonnax 34762-10 case saver you should be able to run the front band.
holy hell, thank you so much for these videos
Glad to help!
@@mountainsgarage do you have a link to your page that you recommended?
I love my th400. I know its heavier than a th350 but it really makes my car feel alot faster. With the th350 I couldn't chirp the tires but with the th400 I can either drive like a grandpa or shred the tires on command. So far I have just been careful on the fwy I have 3.42 gear and it wilk not downshift at fwy speeds. People tell me I can do it but I broke 3 intermediate sprags so I am a bit overly cautious.
the 400 has a lower first gear then a 350 what u really want is a 02xx 400r turbo stock they are good to 800 hp night and day different to a standard 400 turbo . i been getting them for free u can get them out of motor homes and heavy trucks they will have 02xx welded on the bell housing gm sells them as a street strip or heavy applications
@@jeffrey4547 would a th400 out of a military Humvee be a 02xx?
@@SubePelayo928 no it is a crate trans like a crate engine trans combo they are good to 800 hp heavy 8 bolt pump heavy clutches stage 1 shift kit that is how they come stock but it saves a lot if u want to build it to 2000 hp trans
Thanks more thorough then most people on that build.
I added you to the diy th400 fb page lol
Love the video! I am not worried so much about hp level but what are your thoughts on making a th400 with auto shifting as aggressive as you can. I have seen the mild th400 videos. how about an aggressive th400 auto shifting street build. Thanks for all your hard work
Hello mountains, on a th400 street and strip 400 do you have any good advice on without a trans brake build ?
Any do's and don't things thanks.
It sounds like dual feeding the direct clutch wouldn’t help me much but I’ve heard you briefly mention dual feeding the forward clutch. Is there any other modifications needed other than leaving the seal out? And can that be done and run with a stock valve body? Also if you ever need any 2wd output shafts or tail housings i have a bunch of them. I’m always in the market for 4wd output shafts
I don’t know if there’s much demand for it but I was wondering if you’d be willing to make a video on what to do for something that’s even more mild 500 hp and 600 foot pounds of torque auto shift? Thank you
Hi Shawn you have the best videos on TH-cam but wanted to know what length the moduler block off plug has to be?
Do you need a manual valve body for this ? Or can you just add a shift kit and shift manually? Also can I use the stock springs or should I upgrade to stiffer springs ?
shawn you mentioned that the forward hub is a good idea. how crucial is the upgrade is it vs a nicety? is it just towards this power level that it becomes a good choice? what happens with failure?
i have all the tools i think ill need.
-Trans case holder for engine stand
-pucks of various sizes that can be used to press bearings
-clutch depresser tool
-big hose clamp for pump
-dial indicator + base
-sockets, snap ring pliers, picks and various hand tools
-green assembly goo
-3l80e astg book
i also grabbed a supposedly still good th375 for a $150. if the steels/clutches/etc look fine ill reuse them.
-used 9.25" truck output yoke and new tail housing
-sfi housing
-transgo hd intermediate snap ring
-direct clutch drum + 34e sprag (assume 4l80e since it lists for both th400 + 4l80e)
-case saver
-roller bearing + shims
just need to pick a transbrake, both atd and jakes are on backorder. probably go for a jegs/summit kit
thoughts? missing anything?
thanks for sharing! youre an inspiration!
You can find the billet hub for $80ish or less.
Sounds like you have a good plan!
ATD fills orders pretty fast.
Holler if you need anything!
@@mountainsgarage i appreciate the lending hand. Is there a part number for the $80 hub? I'm only seeing the ones around $100+
Hey shawn, is there a particular complete "rebuild kit" that you can reccomend for a stock th400? I've heard alot that waffle style clutches and tan clutches are a good choice. Looking to buy something that takes the guess work out of piecing together what I need
Great info, Can you put a link to these products so we can purchase them all from one place!
Thank you,
B
Awesome!!!!
How much do you charge to build a 1500 hp or so 400 trans
I have a th400 trans from a RV that was bolted to a 454 big block engine with 80k miles. What are some things I would you recommend doing to it or just rebuild it back to stock I'm bolting it to a 5.3 ls engine for the street no racing. Rebuild it with a new converter .
Hey. Just ran across your videos while searching for th400 rebuild. I build a bunch of rock crawlers with LS motors and 400 transmissions. Decided to start rebuilding them myself. In the past I’ve had them apart to swap 2wd to 4wd output shafts but never been into the drums or pistons. All the videos I see are usually for street cars but I hardly ever use 3rd gear. Mostly just 1st, 2nd and reverse. Usually have to run them way over filled with fluid because of standing the vehicle straight up and down. Also sometimes have to grab reverse under throttle to prevent flipping over backwards. Have any build recommendations for something like that?
Interesting! You might want to check out the Demo Derby type mods online. As far as the oil sump I don’t know if anyone makes a swinging pickup in a extra deep pan?
I didn’t have much to offer here, but if I can help in the future just ask!
I have th400 500hp build and not a transmission guy, can you please tell me the tolerance for up and down play on output shaft.
Got my case in the local parts washer after your case prep mods.
Ive got a couple quick questions that would result in having to order a few more parts. For a th400 that will get hammered on by small ls truck engines, should I do the case saver and spiroloc ring? I'm just cheap and like to have fun.
Next is there a pro and con of the spiroloc you showed during the case saver part vs a thicker snap ring? Or is it more of playing with clerances thing?
Last one of the night. I know you turn down the o ring and bevel on the output shaft, you have a lath right there. If one had to pay someone to do that would it be better to just remove the o ring and buy one of the beveled sunnex yokes in 1310 or 1350?
Killer video again. Im loving the th400 vids, definetly building my confidence to just do it. I owe you some beers or a clean down south core the next time I'm up in Maine.
If you are keeping the front band then a thick snap ring or a spiral lock snap ring, your choice both work fine.
You can run a counter bored yoke. I cut the shaft because its easy, cheap, and any yoke will be happy.
Thanks for watching, always glad to help!
@@mountainsgarage last round of questions on this topic. Is there a make/model or part number for the thick snap ring or spiral loc you recomend?
On a different note, if keeping both bands, not running a trans brake, but plan on beating on the engine and trans hard can you run a case saver? Would you recommend that?
@@shocker998md3 I just searched “TH400 intermediate snap ring” on eBay, lots of choices all over the net.
I believe the thick snap ring is a 727 Chrysler part.
Whats the part number for that intermediate spirolok/snap ring for the case? Thanks
what snap rings did u use for the itermediate
You got the best videos on the th400...im building one for my drag week car.. other then the pump mod on one of your videos
Do you know how to make the pump live on the street with a trans brake ? I hear it's kills them in a few thousand miles ..
I will have to side with the majority that doesn’t see TH400 front pumps wearing out very often. I know it was a subject for a while but can’t find much real evidence. Thanks for watching!
Ok thanks , I guess I'll let ya know lol..
I’m building a turbo 408 stroked Windsor I def will need one for my set up I’m a street car also how much does it cost to build one? Thanks !
I'm having a hard time locating some of these parts...Would you make a video giving part numbers on the parts you recommend?
Been watching your videos for awhile now and I’m currently building a TH400 with transbrake but I built the transmission off a video that was removed from TH-cam but i used a reverse manual valve body and cut out the correct passages and blocked off one channel I bought the correct spool for the selector, separator plate and gaskets, and external modulator valve for trans brake but my issue now is in the video the guy removed two spring valve assemblies that were next to each other and put 1in freeze plugs in them but the holes are not big enough for that so would I be ok to leave the shift kit parts in the valve body or can I find a different plug to block off the ports? I’ve done extensive research on it and keep coming up with nothing and you are very knowledgeable about th400 and seem to know what works and what don’t any advice whatsoever is appreciated thanks!!!
That would be a good question for a valve body expert. I would be guessing.
How much would you charge to build a 400 turbo to withstand 1000 horsepower?
Quick question buddy if you’re doing a 400 with a 400-3 Transco shift kit can I leave the inter seal in the direct drum out and including the second ring from the top on the center support
Hello Shawn, I follow all your videos and very much appreciate all the help you have provided to prepare me to build my TH400. I have the Hipster engine braking valve body and BTE bellhousing already and just looking for an overhaul kit for clutches gaskets etc. I would like 5/5/4 clutches, do you have any opinions on a good complete kit rather than trying to price something together? I realize I will still need a few additional goodies such as case saver etc. The goal is to be safe to about 800hp and I am looking at the FTI F4019-4 kit right now. Any insight would be appreciated. Rob
Any good performance trans shop can probably piece you together the neeed parts. No kits likely exist mixing the 4 clutch 4L80E intermediate clutch’s, steels, and pressure plate.
@@mountainsgarage Thank you Shawn!
how long will a pump last with a trans brake? I read somewhere that the transbrake is very hard on the pump will it last 50 passes will it last through a week at rocky mountain race week....what's you take on the situation......thanks love your videos
All performance transmissions benefit from an increase of 20-30 PSI over stock, transbrake or not.
We are only talking about a regulated 200psi.
Most hydraulic pumps make thousands of PSI. I have never seen any increased wear.
Most transmission builders will agree, no issues.
I'm wanting to delete the vacuum modulator and remove the governor on my street strip th400 while using the stock valve body what mods are needed to accomplish this? Thanks
I just did a Video on that two weeks ago, TH400 DIY Shift Kit on my playlist of videos.
Awesome information man have a question for you i have a 700R4 trans can i rebuild it and make it strong enough to handle 800 hp or not just curious
I have seen some advertised claiming they will handle almost that, personally I think it’s going to let you down after a large investment trying to make it do something it can’t.
If you really need overdrive then 4L80E is awesome.
I would take a 2004R over a 700R4 but both are weak by comparison.
@@mountainsgarage How much more expensive/complicated is it to make a 4L80E live at this level compared to the TH400 you detail here?
@@nowayjose596 Everything for the 80E is at least a third more it seems.
I just put 1 of those exact models in my 73 Camaro. I love it but wish it didn't shift so hard 1st to 2nd. Maybe it will last longer that way. Let me know if there is an easy way to soften the 1-2 shift a little. 600 HP 434 dart engine.
What is the valve body?
Hey what’s the part number for the intermediate spiral lock. The larger one you show next to the case saver is upside down and I don’t believe you mentioned it.
thank you for this video. I was wondering if I'm able to do these upgrades without going valve body? i don't plan on racing but i want a reliable long lasting th400. and if adding a case saver to a non valve body trans is fine? thank you.
Do you sell machined direct drum piston
In the video, you mentioned something about a "vent fitting" and "cooler lines." I assume the cooler lines are a reference for a trans cooler correct? As for the vent fitting, I'm not sure if you're referring to an overflow tank, dump valve or something else
What torque rating for this build
i have a th400 in a 6.2 diesel k5. I have a lot of engine roms and I get little power. What could be failing?
Start simple with oil level, plugged filter.
Can you explain how important it is to start a burnout in 2nd. I never got that. I think I hurt one shifting 1st to 2nd at 6000 with sticky tires. Not spinning. 600 HP. If it hurts these trannys that easy isn't a beefed up T350 better?
So what would be the best way to burnout if i have a manual automatic? Can't start burnout in second for that reason.
If it’s manual start in second, shift to high and roll out towards the line. I guess you are saying it’s not full manual, so go 1,2,3 quickly and don’t let it hook in second.
I'm in the uk and trying to build a th400 for my 1000hp nissan 300zx and need help sourcing the parts I will need etc. I was hoping this would be something you could help with ? That's assuming you ship to the UK.
Now would this be acceptable for a dyno tested 510hp, or will I be better off leaving it as is, I got to fix reverse any way so I figured wile I got it apart will it hurt to do this?
Might as well beef it up!
any suggestions for building something like this cheap. I know 1000hp and cheap shouldn't be in the same sentence. But it would be cool to see something someone who doesn't have a bunch of extra cash could build.
If you shop for deals and already have the transmission, you might get it done reasonably inexpensive.
@@mountainsgarage I'm hoping to try. I can get a core for about $80 which is certainly helpful
Do you have a 1200hp - 1500hp formula you could share with us as I am looking to moving from 1100hp glide to a 1200hp -1500hp TH400 as motor now making 1400 at the flexplate.
I have a question for you. I have a turbo 400 in my car runs 980s at 137. The car works great except for when we go to push it out of the trailer. It does not want to backup. Worth of shit goes forward. Fine pushing it. I just had it serviced new clutches and stuff and it still won't push backwards worth of crap pull the driveline out. The car pushes backwards like nothing. Have any ideas?
Hello friend, I saw your video and I would like to get a question right, I took my th400 transmission to be repaired but it did not make the third change, I already changed the governor, modular, converter, and it continues the same, now to your great experience what will be the problem for which Does the third change not make the transmission? please help
Hey is it possible to build toyota 8spd to withstand 800hp?
I don’t know?
Will a th400 with the mods to the pump and valve body withstand long highway use?
No problem!
Hey Mountain Garage. iv'e got an early TH400 i picked up and had been sitting outside and may have taken in some H20.
I think i heard you say if one takes in water it's not worth overhaul, should i open it up and see how bad it may be?
What do you think ?
I did a few videos last summer on stripping three Pontiac HD TH400’s that were full of water. I saved a lot of parts and was able to soak the rusty stuff in rust remover and save more. Definitely rip into it and see.
I have three more of the HD Pontiacs to see what is inside.
Merry Christmas!
@@mountainsgarage Thank you Sir and Merry Christmas to you and your family 🎄
Whats your 800/1000 HP build cost ? Been through the ringer with my Chevelle and transmission shops !
Part number for larger snap rings?
I will look. I just searched TH400 spiral lock and found both.
@@mountainsgarage thanks I found them and ordered both. Watching your videos to help do this build of mine. Thanks again a ton.
How much do you charge to have a th400 rebuilt if you are rebuilding at the moment? I would love to have my transmission rebuilt by someone who has a passion for transmissions
It depends on options, supplied parts , ect.
Hello. So im on final assembly and had a question. So i pretty much followed your instructions to a tee but im going with the auto shifting vb with the mods you suggested. Question...Should i run the engine braking band? Also is there any mod to do to the rear accumulator for the reverse band?
You can run the band of you wish.
No mods to the rear servo unless the transbrake instructions call it out when installing one.
@@mountainsgarage So leaving it out with auto shifting wont cause issues with the sprag down the road? Also, if leaving it out are you plugging the case hole or just installing the accumulator piston in the case?
I need one of.the 4l80drum for a turbo 400,,can I buy one from you???
hey man is the ROSSLER TH400 XHD WITH 210 first, 1.4 second and 1.1 Third good? also what stall would you recommend for a 1000hp wheel hellcat, running a 50 tall tire, 4800 race weight
Popular transmission with small tire racers. Just guessing from what you wrote around 4500ish. Thanks for watching!
@@mountainsgarage understood ty
nice video ....how much hp 4l80 hub rated?
I think popular opinion is 800ish depending on weight.
Where are you located? Sounds like I need you to build me one. Great video. A lot of great information here.
Maine
Alil far from Nc but Im sure its worth the trip. Keep up the good work
@@Carolina_Squid Thanks!
Can I run this setup with the factory vb and a shift kit ?
For a while as long as the hydraulic pressure and fluid delivery keeps up with the stress placed on the transmission. Not ideal but possible.
What will a stock 400 handle. I'm making about 550 on a stock transmission and Wondering if it's still safe or if I should be worried
If it’s in good shape I wouldn’t worry too much if it’s a light vehicle. They are pretty stout. You could put a shift kit and a race filter while it’s in the car.
@@mountainsgarage it's not a light car. It's a heavy mud truck.probably 4500 lbs. Only problem so far was a stuck governor.
What clutch pack would you use for 1100 hp. I was going to use alto power packs with all the mods and a coan transbrake. Can’t find anyone who has them in stock. What would be the best alternative.
Any name brand clutch will be fine. Borg Warner, Alto, etc. I use the green ones.
@@mountainsgarage one more question if you don’t mind. What should the Stack height be for the forward clutch’s and steels. Also the normal thickness for the plate on the forward clutch hub drive. I was trying to determine if it had been cut. Thankyou very much. Love your channel
@@drjf1 Stack heights vary with the piston. I am not in the shop to measure a plate, but will.
So stock input main and output shafts are fine upto 1200hp ? Is this correct no need to change to billet ?
It depends on weight and traction but that is where you need to start being concerned.
good to know the stock stuff will hold up with half the hp cheers mate
Hell I'm still trying to get a solid answer on how much a bone stock 400 transmission can take.
They held up fine in 4-500 HP cars when they were new.
But that was a long time ago, like 50+ years, last TH400 was 30 years ago.
It all comes down to HP, Weight, and Traction if the transmission is in perfect shape. Add in condition to that equation if it is indeed bone stock.
Shawn -
Still waiting on parts...?
Do I use spiral lock if I'm running a transbrake?
Spiral lock or a HD Snap ring.
Thank you
Stock drum input intermediate and output shafts all good for 800hp?
Only upgrades I really see for those are all rated at 1200hp and up is only reason I ask.
There are local guys well over 1000hp with stock shafts. Weight and traction are also a factor.
The inputs come with a larger spline in a stock drum, main shaft is an easy swap.
The output is probably the last to worry about, but when someone wants to upgrade I do all three.
Next, do a 2000 horse one. hehe
Everything he said plus aftermarket Reid case and bellhousing, NASA billet shafts, NASA rear and front drums, billet valve body, billet yoke, maybe even a billet pump...etc. So I've been told,maybe I'm wrong. If you find out differently let me know?
Can it handle high speed(100-120) for a couple of hours?
I don’t see why not
Thanks
👍
do you do rebuilds for customers? if so where are you located?
Maine
Hi Shawn,
I'm in northern NY and I'd like to have a 400 built by you. I'm getting my hands on one soon. How do I contact you for a quote of this build?
Running ~600 but want room to grow
You can email me at smountain1@roadrunner.com, Thanks!
My transbrake sometimes won't engage but I can hear it click
External solenoid?
Start simple with checking voltage and a solid ground. And make sure the valve is smooth in the bore.
Internal same deal.
Thank you. Internal. I dropped the pan and pushed it in and out multiple times and it seems smooth. It works more often than not. I could here it click on the release but it wasn't engaging. I can get a new one. I just wanted to pick your brain to make sure I hadn't missed anything internally that could cause the intermittent issue. I followed your videos to do my build. Thank you for the great videos.
Sounds like a 4l80 is about the same but with another gear. For us street guys
Street guys?
I daily my th400 with a 6000 stall and 4.10s
Yes but the 4l80e requires a very expensive convertor. I have seen them go from 1500 for bare minimum to 3000+ depending on your goals
Part number for spiral lock?
The kit that contains the intermediate case spiral lock and the direct clutch sprag spiral lock came from Feiock Performance on eBay, part number FP400SLK. I see other manufacturers use their own part numbers. I searched TH400 spiral locks.
@@mountainsgarage Thanks for your time and vids greatly appreciated.
How much is it to rebuild a th400
As described in the video around $2000ish if someone comes with their own core.
@@mountainsgarage thanks
800-1000hp, you have a request to do 1500hp! Someone jump the gun and asked 2000hp
I am working on it!
i cant use the oem 4l80 hub on my th4oo 800hp turbo ls...cant hold this hp..?
Yes the 4L80 hub is fine at this level.
I am sorry it’s early I thought you were talking Sprag race, I believe the 4L80E Forward hub is good for 800ish.
@@mountainsgarage yes i have a the 34 element
@@mountainsgarage You have a phone number
@@jorgelozada5582 207-831-6805
Great video. And I'm leaving a comment from now on so you can make more money, Shawn . Google makes enough money and needs to share with those that got them there, right? This isn't college sports where the guys making the money don't get paid.
Thanks! Appreciate it!
You must be an idiot, college sports and scholarships over $100k for playing a game
@@timweb1510 college players are banned from making money.
@@dobermanracing what was that you posted? Must have got that news from cnn or msnbc
My friend runs low 420s.they refresh it once a year.