Hey I have a question is a 400 cubic engine a good engine and will t56 6 speed transmission be good for it I’m putting it in my 94 impala ss have not bought it yet but that’s what I’m thinking to get
Built 454 in a 1 ton Chevy 4X4. Will be my first DIY auto trans build. You just saved me some possible costly mistakes I could have made. You got a like and subscription. Thanks!
great info,used to run a switch pitch behind a 455 buick,'73 regal,had a toggle switch on the dash,my secret weapon,got around 2200 stall,was great fun
Very good informative video. Just picked up a TH475 out of a 21k mile motor home and going to use it as a 2 speed. Your video has some good stuff in it. Thank you!
@@12yearssober It could be left as a 3 speed and leave in second gear or made into a dedicated 2 speed. 1st gear is worthless with 1500+ Hp and a small tire.
"they don't explode like torqueflites, and stuff like that" Lol. The the New England area accent is great. Also, straight cut gears reduce thrust loads on the geartrain. Also found in 4L85E units.
Well done you are the most knowledgeable chev old school builder I’ve came across . I wonder sometimes how many generations left before the big mussel car following will be forgotten? Good news the upcoming motor heads have channels like yours to mentor from , the only thing I would be concerned with is they don’t mis interpret car for something that sounds like kaur.... ? Lol couldn’t resist hope you have a sense of humor, out here in the NW we don’t think we have accents but I’m sure others would say otherwise.. I’m just guessing but my friend from the nor east are not shy to say what’s on there mind or getting the point across straight up with colorful linguistics. New sub to channel can’t wait to binge watch a few more BA
Years ago, I busted a tail housing. I crawled under some old turd at the junk yard and removed the tail housing on some older car (probably a 70s model something or another). It didn't have a driveshaft in it, so that made it a little easier. I didn't know it when removing it, but it wasn't for a normal th400 size yoke. It was a short shaft tail housing, but it was in-between a th400 & th350 size yoke. 400 yoke wouldn't slide in it at all and a 350 was loose. It's the only one I've ever seen like that. I have never found any information about it.
Thanks for the more info video, I am in the process of building a straight cut for my square body, and you showed me a few things that I didn't know. I hope you get more subscribers.
I'm dropping my case off today to get cleaned. I followed some of your case mods and between your videos, and a manual I'm just going to try out a rebuild. Worst case is it doesnt shift like before, but all the clutches were smoked. Thank you for all your 400 info!
@@mountainsgarage ive got a couple questions for you bud. 1. Before installing the pump I gave the output shaft a spin, it moves but it definitely isnt silky smooth. It takes sone umph to get it all moving. Should it be slick like spining a crank in bearings in a block? 2. I dont plan to use the Speedo cable, I saw the core plug for that. I also dont plan to run a kick down and just manually shift it, I can just remove the solinoid and the connector plug right? Or is anything else needed? Lastly is there anything I need to check with the pump out and the new ptc convertor? Or just lube up, install and check that the pump gears engage the comverter and turn the pump? Im getting the new guy jitters but so far everything went together decent, all the drum seals suck for a newbie and not cutting them.
@@shocker998md3 The tailshaft might turn easier one way than the other. If you got the center support bolt in and the snap ring and it still turns, it’s probably fine. I usually try the hub of the converter through the pump bushing if it’s apart but it’s never a fitment issue, just lube it up and put it in. No need to be nervous, you know how to fix it!
If I want to run a slip yoke on a TH400 that was originally in a truck with a bolt-type yoke, do I NEED to find a yoke with the counterbored recess to make sure the yoke has proper engagement? Based on 17:48 , it seems like the regular yoke without the recess is bottoming out against the o-ring ridge on the shaft. I'm wondering how long that yoke would stick out past the tailhousing
The easiest way is to machine/grind off the o ring groove and run any yoke. Second choice is running the counter bored yoke and not machine the shaft. I machine every one. I cover it better in other videos. Thanks for watching!
Mine doesn't kick down from 3rd. How do I tell if I need a vacuum or electric solenoid? I think the one in there now has a rotted old vacuum hose on it. Haven't crawled under there for years.
Ya know when i tore my 400 apart and cleaned it and sorted it it did not end up looking like your th400! hell i even cleaned it twice, and i waited for it to turn black and the shield to materialize but it still looks like an empty th400 case, maybe i am not holding mouth right.
No need to buy anything, just unbolt the yoke and remove the O ring on the output shaft. I cut the O ring groove off in the lathe so a standard yoke has full travel. You can also buy a recessed spline yoke that will go over the O ring groove also so no machine work is required.
@MountainGarage Just subscribed thank you for sharing this information. I finished a th400 build for my Cadillac engine. It was the first time I ever done one. Is their a fix for the front pump 6Oclock bolt hole? I think I stripped it. Anyway, my torque wrench never clicked and the bolt won't tighten. It leaks. After I installed a Hughes stall it leaks a lot more. I do have a spare but its a 72 case from a Pontiac Wagon. I just don't want rebuild it again. But my gut tells me I will.
@MountainGarage Is it possible to identify a th475 from a th400. I bought a th400 supposedly but it had the parking brake housing on it. Leading me to think it maybe a 475. I.D. tag. Has 86-FM
Great video I have had several t400's over the years, in my Streetrod drivers, and always have front fluid leaks, what seal do you use on front pump main shaft seal to converter, which seal is best? any tips tricks on installing? I always carefully support and slide converter on to main shaft then rotate till engages the splines and slides rest of the way back into the front pump. Am I destroying the seal by pushing the converter all the way back?? any secrets I'm missing?? sick of front oil slick on the floor, please help
I have used them all, but if I am buying one than National or Timken brand. More likely the leak is caused by a worn pump bushing, or the pump gasket and o ring. Thanks for watching!
@@mountainsgarage idk if that's easy or not lol I'm a newbie and don't know much about any of that 😂 do you mean if the tail is the same length it should be good. Im pretty sure these are dumb questions I'm asking 🤣
Metric ans standard bolts just reminds me of my grandpa. We still use bolts nuts and what have you he collected. Still saving me time and money with his wisdom. I'll help continue these old things because if its not broke don't fix it, just upgrade it.
The metric thing is easy to explain. In the late 70's, GM announced that they were shifting to metric fasteners...sort of. Their wording was that "only new machining will be switched to metric. So, if you were a mechanic working on GM cars, you needed both SAE and metric tools, because when you started working on, oh, say, a front end, you never knew if the part was new or old machining. It was a real pain for at least 5 years, until every part on a new car was new machining and thus metric.
Buy a ultra bell so much better then the shield, and ICT makes the aluminum plug for the electrical kick down delete and it only cost around 11.00 dollars
Thank you for sharing your wealth of knowledge with us all nothing beats experience I am getting parts together to do a T400 build for my 69 Firebird 455 street/strip car I was planning on using a H.D. chevy case w/BOP adapter built have been told by a couple people that that experienced eating up ring gears by doing so ,I located a BOP case but it appears to be really lightweight to say the least You mentioned a H.D. pontiac case? If so how would I I.D. such a case in a search for one? what is your thoughts on using case adapters? Also what type of clutches would you rec. in my build Thank you for your time~
Thanks for the nice words! Look in my playlist I have a few videos stripping HD Pontiac cases in search of the right one for my personal transmission. I also have videos of removing the bellhousing and installing an SFI housing, some with both bolt patterns. Any brand name clutch, Borg Warner, Raybestos, Alto, etc. will work fine. Smooth or waffle is another choice but either will live a long life with good clearance and pressure.
Do you have any videos building a good strip one manual valve body trans break more of a beginer kind of video 600 to a 1000 hp figure ill build a good stout motor then throw a few big turbos on it
Since I’m only building one trans for me, a th400 for a turbo 67 gto to support 600 hp. Who’s kit would you recommend? Watching your videos I realize need a billet drum, thick washer, roller bearings, a few other things as well, there really isn’t a complete kit per say. So figured I’d get a good kit and add the other items to round it out. Thanks.
I just finished rebuilding my th350 and have it in my 61 Chevy C10 pickup. I have an issue with tranny fluid pushing out the tranny dip stick. After diagnosing the problem I blew air into the dip stick to check the that the breather vent isn't blocked in any way. I removed the vent tube and found that the passage way to the breather vent cap doesn't vent. So the tranny is building up pressure and blowing out the fluid through the dip stick tube. I followed all steps when rebuilding and can't figure out what the blocked is caused from. Anyone have any ideas before I pull the tranny from the car and take it apart again. Thanks
My buddy had a mid 70's pickup with a 454, when you dropped the gearshift into 1st and stomped on it it would jump to 2nd gear on its own. Is that something gm did special to trucks?
Just had my turbo 400 or 375 rebuilt but it's very hard to shift took it back in the car they dropped the pan said they fixed it (bullashit) still can't shift into 1 or 2 or past drive easily by hand with out the shifter that worked fine before they told me it's good get a new shifter what could be making it so hard past neutral
@@mountainsgarage I see, I did not know how long the modulator valve was[4"]roughly and controlling the other fluid passages from where the tb solenoid ends.
Great heads up info. Have a THM 400 on my stand presently and will be using a couple your suggestions, on this build. How anyone could dislike this video is way beyond me. Maybe a THM 350 video just like this one?
Heavy duty in a light duty veh maybe but this is in wise a "heavy duty transmission", it goes in 3/4-1 ton applications, that classified as light duty. Heavy duty is class 8/Semis.... I locked one of these up just getting my RV stuck in the yard nd tryig to rock it back and fourth (complete stops between changing between R&D)... Didn't even have alot of miles on that rebuilt slush box, not impressed. Relaxing video to watch though, thanks for sharing.
Patrick Baptist I agree its all relative. I spent 28 years as a Diesel Mechanic, fixed them all. But a modified TH400 sees 3000+ HP these days. But far from stock.
Thanks for the video. Great info. I have a TH400 in my 68 Grand Prix. My second to third shift is way too early. I want to get it to be much longer and stronger shift. Would this be a governor adjustment /rebuilt or vacuum modular adjustment?
You are on the right track. I would start by going to the TH400 section of the Crankshaft Coalition website and perform the auto shift valve body mods first. A adjustable red stripe modulator turned in a few turns helps as well. Governor springs can adjust WOT shifts.
try a 02xx 400r trans i bet y would love it plus u can get them out of heavy trucks or motor homes stock good to 800 hp i get all mine for free .stock they make the perfect trans for the street
@@mountainsgarage thanks learning all this stuff as I go! I’ll start with a catch can for now just for the safety, but ive notice it only seems to puke out when I’m going up a bridge after driving the highway for a while. leads me to believe I’m getting the trans hot after watching ur video. Running a derale cooler so I’ll double check all that.
Hi, what can you tell me about the TH400 Switch Pitch. I have one from an old caddy and have a chev case to swap the parts. Any issues in doing this and how much torque with the variable vanes take? thanks
@@mountainsgarage Hi, at one time Prostreet was popular and it was transmission of choice. Rare unit found in BOP &Cadillac 64' -67'. I have a 3rd gen Camaro with a Dart based 421 for fun sales. Gonna try it. If that doesn't work I'll try a Steel Glide I have. Anyways, I subscribed so keep the info coming. Peace.
@@mountainsgarage no unfortunately. I’m located in Wisconsin. I do have a guy that can build me a 400 but ‘he don’t do heavily built 400’s often’…… and I don’t really want to pay some of these prices as some shops want. I just want a built 400 that won’t break the bank….I’m not afraid of spending money but I just don’t get a good feeling from a couple places around me. I’ve watched a bunch of your videos and you obviously know your stuff. I did join that DIY th400 page on Facebook today. I’m building a Chevy colorado with a turbo 6.0 in it. I’m expecting 900 or better with the turbo I have. I know nothing about rebuilding transmissions and I have no interest in experimenting either. Just need to find a honest builder or something. Or just a parts list and I’ll just get it done by me. I appreciate any help. I’m just afraid I’ll be taken for a ride at my local shop….. kinda sad isn’t it? Of course I want a trans brake. ATD I think I was set on.
@@daviddenman7479 Well ATD is also in Wisconsin and they build fine transmissions. In my playlist I have a recipe for that power range so you will have an idea what you need.
Looking at the history of the 475 it only says they were installed starting in the early 70’s. So long story short I don’t know but will make it a quest to find an older unit and find out!
what u want to start with is a 02xx 400r turbo stock they are good to 800 hp they came with the bigger pump heavy clutches stage one shift kit with a few other up grades . u can find them in heavy trucks and motor homes this is what u want to start with gm crate trans it will have 02xx welded on the bell housing . plus u can get them for free last year i got 4 crate set ups with the 454 450 hp with the 02xx trans from 6,000 to 58,000 miles on them all for free .gm calls them street strip or heavy applications trans
I’m running a th400 trans with straight cut gears; what gear ratio did Gm offer , I was told by a previous owner that it had a 2.10 first gear is that possible
Austen Loan Yes but the middle passenger side bolt can’t be used because it doesn’t exist in the block. I install a Helicoil in the vacant hole in the transmission case to mount the dipstick or transmission shield.
@@mountainsgarage They have been in the shop this whole time. The guy I bought it from passed away and he was a mechanic. House came with 3 big blocks and 4 small blocks and 2 c10s with big blocks lol so keeping some stuff to finish and selling the rest. thank you for the info! they look to be in good condition with tags ready to go.
Trying to find any information on any TH-cam channel. Wanted to know what all i can upgrade and still keep my switch pitch internals and hold 1200hp. Most of the poeple on here want to keep them on factory stock engines(425 olds or 500 cad). I've got the Reid case with ls style bell that I'm dying to convert.
straightedgecmp Yes you need to remove that safety feature built into a TH400. It requires a few mods in the valve body, pretty simple. Lots of info online. A shift kit will also address the situation.
Great educational videos you have. Nothing commands more respect than the voice of experience
Thanks! Love the positivity!
I've been a Trans builder for over 40 years and this is good info,Thank you!!
Hey I have a question is a 400 cubic engine a good engine and will t56 6 speed transmission be good for it I’m putting it in my 94 impala ss have not bought it yet but that’s what I’m thinking to get
Great video👍This is where TH-cam shines with guys sharing their wisdom. Saves time and money 👍👍👍👍👍
Built 454 in a 1 ton Chevy 4X4. Will be my first DIY auto trans build. You just saved me some possible costly mistakes I could have made. You got a like and subscription. Thanks!
Awesome Thanks!
Your knowledge and experience are vast!! Just found your channel, appreciate your secrets, you really could charge for this!
Thanks for watching!
great info,used to run a switch pitch behind a 455 buick,'73 regal,had a toggle switch on the dash,my secret weapon,got around 2200 stall,was great fun
Iv watched this video more than a few times. One of these days I'm gunna pony up and have u build me a real honky tonk th400
I have 64 or so TH400 videos in my playlist, we can do this!
Dan watched my channel!!
Great vid and a heap of knowledge 👌🏻
Interested to know why the internal transbrake solinoid is prone to getting stuck and how to prevent this, cheers
That's beautiful transmission. I have a TH 400 and hope it turns out that nice!! Great Video and I liked the accent!!
Thank for the info, it's always a good help. Cheers from 'down under'🇦🇺 Oz 🇦🇺
That's a great idea on the vent hole tapping. I'll do that for sure.
Very good informative video. Just picked up a TH475 out of a 21k mile motor home and going to use it as a 2 speed. Your video has some good stuff in it. Thank you!
????
@@pmotorsports8276 ?? about what?
dragginfool
Can it be made a two speed?
@@12yearssober It could be left as a 3 speed and leave in second gear or made into a dedicated 2 speed. 1st gear is worthless with 1500+ Hp and a small tire.
@@dragginfool Man you"ll shred them to pieces running small tires..lol
"they don't explode like torqueflites, and stuff like that" Lol. The the New England area accent is great. Also, straight cut gears reduce thrust loads on the geartrain. Also found in 4L85E units.
Well done you are the most knowledgeable chev old school builder I’ve came across . I wonder sometimes how many generations left before the big mussel car following will be forgotten? Good news the upcoming motor heads have channels like yours to mentor from , the only thing I would be concerned with is they don’t mis interpret car for something that sounds like kaur.... ? Lol couldn’t resist hope you have a sense of humor, out here in the NW we don’t think we have accents but I’m sure others would say otherwise.. I’m just guessing but my friend from the nor east are not shy to say what’s on there mind or getting the point across straight up with colorful linguistics.
New sub to channel can’t wait to binge watch a few more
BA
Thanks for watching!
Years ago, I busted a tail housing. I crawled under some old turd at the junk yard and removed the tail housing on some older car (probably a 70s model something or another). It didn't have a driveshaft in it, so that made it a little easier. I didn't know it when removing it, but it wasn't for a normal th400 size yoke. It was a short shaft tail housing, but it was in-between a th400 & th350 size yoke. 400 yoke wouldn't slide in it at all and a 350 was loose. It's the only one I've ever seen like that. I have never found any information about it.
I have a couple of them. I talked about them in another video.
@@mountainsgaragewas it a th375 ?
@@WilliamBrown-tx5gl No
Thanks for the more info video, I am in the process of building a straight cut for my square body, and you showed me a few things that I didn't know. I hope you get more subscribers.
Thanks for your videos! Wish I could bring my TH400 to you for a bench build. Not impressed with any trans shop near me,Sadly
Awesome videos! Always learning new tricks and methods of improving my work, Thank you!
Ben Smith
Old video but still gets the most views. Thanks for watching! I have around 100 or so TH400 videos on my channel.
I love your accent so much man. 😂
Thanks for the video. About to drop the th400 in my buddy's 66 C10 and this had a lot of awesome info in it.
I'm dropping my case off today to get cleaned. I followed some of your case mods and between your videos, and a manual I'm just going to try out a rebuild. Worst case is it doesnt shift like before, but all the clutches were smoked. Thank you for all your 400 info!
Great! Any questions feel free to ask!
@@mountainsgarage ive got a couple questions for you bud.
1. Before installing the pump I gave the output shaft a spin, it moves but it definitely isnt silky smooth. It takes sone umph to get it all moving. Should it be slick like spining a crank in bearings in a block?
2. I dont plan to use the Speedo cable, I saw the core plug for that. I also dont plan to run a kick down and just manually shift it, I can just remove the solinoid and the connector plug right? Or is anything else needed?
Lastly is there anything I need to check with the pump out and the new ptc convertor? Or just lube up, install and check that the pump gears engage the comverter and turn the pump?
Im getting the new guy jitters but so far everything went together decent, all the drum seals suck for a newbie and not cutting them.
@@shocker998md3 The tailshaft might turn easier one way than the other. If you got the center support bolt in and the snap ring and it still turns, it’s probably fine.
I usually try the hub of the converter through the pump bushing if it’s apart but it’s never a fitment issue, just lube it up and put it in. No need to be nervous, you know how to fix it!
And yes core plugs are fine. I would leave the kick down solenoid bolted on to prevent leaks if it’s a stock VB.
You're a very sharp guy! Great videos.
I thought I had general knowledge of the th400....then I watched your video. 😁 Thank you!
If I want to run a slip yoke on a TH400 that was originally in a truck with a bolt-type yoke, do I NEED to find a yoke with the counterbored recess to make sure the yoke has proper engagement? Based on 17:48 , it seems like the regular yoke without the recess is bottoming out against the o-ring ridge on the shaft. I'm wondering how long that yoke would stick out past the tailhousing
The easiest way is to machine/grind off the o ring groove and run any yoke. Second choice is running the counter bored yoke and not machine the shaft. I machine every one.
I cover it better in other videos.
Thanks for watching!
@@mountainsgarage thanks for the info, great video
@17:17-27 how do I pull off the pressed on steel gear without ruining it, Thanks for info if sharing
Wow, lots of excellent information here.
I'm about to own a el camino with a 350 and turbo 400 transmission. This is fascinating info!!
Are you familar with richard at precision trans in amarrillo tx do you agree the way he does his 350 and 400 s
Great video love your voice
Good video. Thanks for your time and effort to get this out.
Thanks for watching, I have other TH400 videos also.
Rebuilding one of these to run behind a 454.
Thanks for the info!
What kinda transmission oil r u going to use?
Mine doesn't kick down from 3rd. How do I tell if I need a vacuum or electric solenoid? I think the one in there now has a rotted old vacuum hose on it. Haven't crawled under there for years.
Ya know when i tore my 400 apart and cleaned it and sorted it it did not end up looking like your th400! hell i even cleaned it twice, and i waited for it to turn black and the shield to materialize but it still looks like an empty th400 case, maybe i am not holding mouth right.
I’ve gotta HD TH400 I’m putting in a 67 C10 behinds 496 Stroker motor.
I know I'll be watching this again after I get my TH400 on a bench. It came from a motor home and will be going into my 57 Two-Ten.
Dude knows his transmissions 👍🏼
Can you take the truck yoke off and use it like that in a 2 wheel drive car or do you have to replace tail shaft and housing?
No need to buy anything, just unbolt the yoke and remove the O ring on the output shaft.
I cut the O ring groove off in the lathe so a standard yoke has full travel. You can also buy a recessed spline yoke that will go over the O ring groove also so no machine work is required.
@MountainGarage Just subscribed thank you for sharing this information. I finished a th400 build for my Cadillac engine. It was the first time I ever done one. Is their a fix for the front pump 6Oclock bolt hole? I think I stripped it. Anyway, my torque wrench never clicked and the bolt won't tighten. It leaks. After I installed a Hughes stall it leaks a lot more. I do have a spare but its a 72 case from a Pontiac Wagon. I just don't want rebuild it again. But my gut tells me I will.
Nice video, well informed and a Hot Rod perspective. learning on this one. Thank you!
@MountainGarage Is it possible to identify a th475 from a th400. I bought a th400 supposedly but it had the parking brake housing on it. Leading me to think it maybe a 475. I.D. tag. Has 86-FM
Seems to be a P chassis transmission with a 5.7 engine. A 475 is the listed transmission. So good chance!
Enjoyed the content!!
Great video I have had several t400's over the years, in my Streetrod drivers, and always have front fluid leaks, what seal do you use on front pump main shaft seal to converter, which seal is best? any tips tricks on installing?
I always carefully support and slide converter on to main shaft then rotate till engages the splines and slides rest of the way back into the front pump.
Am I destroying the seal by pushing the converter all the way back?? any secrets I'm missing?? sick of front oil slick on the floor, please help
I have used them all, but if I am buying one than National or Timken brand.
More likely the leak is caused by a worn pump bushing, or the pump gasket and o ring.
Thanks for watching!
When replacing the older TH400 o-ring seal on dipstick, to get it “perfect” is it best to drain the fluid?
I have a question
My Cutlass th400 just gave out
If I got a chevy 400, all I would need is a adapter plate and it should be good to put in?
As long as your tail housing is the correct length there is an adapter available.
Or swap everything into your Olds case.
Thanks for watching!
@@mountainsgarage idk if that's easy or not lol I'm a newbie and don't know much about any of that 😂 do you mean if the tail is the same length it should be good. Im pretty sure these are dumb questions I'm asking 🤣
Good questions!
Yes the TH400 came in a few different length output shafts and matching tail housings. If it matches yours then go fo it!
Metric ans standard bolts just reminds me of my grandpa. We still use bolts nuts and what have you he collected. Still saving me time and money with his wisdom. I'll help continue these old things because if its not broke don't fix it, just upgrade it.
I have vavle body from Florida. ATF transmission factory.. with no engine brake.. so can I do plug #8 on converter feed resistor??
The metric thing is easy to explain. In the late 70's, GM announced that they were shifting to metric fasteners...sort of. Their wording was that "only new machining will be switched to metric. So, if you were a mechanic working on GM cars, you needed both SAE and metric tools, because when you started working on, oh, say, a front end, you never knew if the part was new or old machining. It was a real pain for at least 5 years, until every part on a new car was new machining and thus metric.
Buy a ultra bell so much better then the shield, and ICT makes the aluminum plug for the electrical kick down delete and it only cost around 11.00 dollars
Thank you for sharing your wealth of knowledge with us all nothing beats experience I am getting parts together to do a T400 build for my 69 Firebird 455 street/strip car I was planning on using a H.D. chevy case w/BOP adapter built have been told by a couple people that that experienced eating up ring gears by doing so ,I located a BOP case but it appears to be really lightweight to say the least You mentioned a H.D. pontiac case? If so how would I I.D. such a case in a search for one? what is your thoughts on using case adapters? Also what type of clutches would you rec. in my build Thank you for your time~
Thanks for the nice words! Look in my playlist I have a few videos stripping HD Pontiac cases in search of the right one for my personal transmission. I also have videos of removing the bellhousing and installing an SFI housing, some with both bolt patterns. Any brand name clutch, Borg Warner, Raybestos, Alto, etc. will work fine. Smooth or waffle is another choice but either will live a long life with good clearance and pressure.
where'd you get your AN trans cooler fittings? I'd like to possibly swap my stock ones
Do you have any videos building a good strip one manual valve body trans break more of a beginer kind of video 600 to a 1000 hp figure ill build a good stout motor then throw a few big turbos on it
Since I’m only building one trans for me, a th400 for a turbo 67 gto to support 600 hp. Who’s kit would you recommend? Watching your videos I realize need a billet drum, thick washer, roller bearings, a few other things as well, there really isn’t a complete kit per say. So figured I’d get a good kit and add the other items to round it out. Thanks.
Shop around, if you hurry many Cyber Monday deals around.
Try to get a Master kit with bushings and steels.
I just finished rebuilding my th350 and have it in my 61 Chevy C10 pickup. I have an issue with tranny fluid pushing out the tranny dip stick. After diagnosing the problem I blew air into the dip stick to check the that the breather vent isn't blocked in any way. I removed the vent tube and found that the passage way to the breather vent cap doesn't vent. So the tranny is building up pressure and blowing out the fluid through the dip stick tube. I followed all steps when rebuilding and can't figure out what the blocked is caused from. Anyone have any ideas before I pull the tranny from the car and take it apart again. Thanks
I heard you say it’ll work in a Cah, but will it work in a car?
I heard that too and thought the exact same thing !!
My buddy had a mid 70's pickup with a 454, when you dropped the gearshift into 1st and stomped on it it would jump to 2nd gear on its own. Is that something gm did special to trucks?
@@rayhuggart5214 All TH400s will override and shift into 2nd. Easy mod to eliminate that feature.
@mountainsgarage thankyou
Just had my turbo 400 or 375 rebuilt but it's very hard to shift took it back in the car they dropped the pan said they fixed it (bullashit) still can't shift into 1 or 2 or past drive easily by hand with out the shifter that worked fine before they told me it's good get a new shifter what could be making it so hard past neutral
I'm bringing mine over tomorrow,I'll pick it up in a year or two.
Perfect!
Wonderful...Good Job !!!
Thanks for all the valuable information!
And Thanks for watching!, Appreciate the feedback!
On the trans brake how far does the valve go into the trans fluid passages?
The external solenoid in this video moves the stock modulator valve.
@@mountainsgarage I see, I did not know how long the modulator valve was[4"]roughly and controlling the other fluid passages from where the tb solenoid ends.
Could you do a video on the kick down on turbo 400 is it needed or not needed?
Great heads up info. Have a THM 400 on my stand presently and will be using a couple your suggestions, on this build. How anyone could dislike this video is way beyond me. Maybe a THM 350 video just like this one?
Can I replace my 700R4 4x4 transmission with a turbo 400
Most excellent review I learned something new every time I watch your videos😃😃😃😃😃😃😃😃😃😃😃😃🤔🤔🤔🤔🤔🤔🤔🤔🤔👍👍👍👍👍👍👍
If you're running the street with that th400 will you have the radiator connected to the cooler lines?
@@Siky1-e1x You can, or run an independent cooler, or both.
Heavy duty in a light duty veh maybe but this is in wise a "heavy duty transmission", it goes in 3/4-1 ton applications, that classified as light duty. Heavy duty is class 8/Semis....
I locked one of these up just getting my RV stuck in the yard nd tryig to rock it back and fourth (complete stops between changing between R&D)... Didn't even have alot of miles on that rebuilt slush box, not impressed.
Relaxing video to watch though, thanks for sharing.
Patrick Baptist I agree its all relative. I spent 28 years as a Diesel Mechanic, fixed them all. But a modified TH400 sees 3000+ HP these days. But far from stock.
Is there a way to clear the vent without disassembling my th400
@@MFDBLACKESTHART You could blow into it but the debris will end up inside the transmission.
What yoke do I need for my 1969 Buick turbo 400
Most likely a 32 spline in whatever U joint size needed.
Some TH400s had the smaller 27 spline.
Were do you get your good dipstick tubes i have aleaking lokar stick.
Proform 66182. I find them at Jegs, Summit, or Amazon.
Is there any advantage to running the stud conversion for the pan ?
It definitely saves the threads is you loctite the threads in the case.
Probably the best transmission GM ever produced.
the bar is pretty low there 😂😂
It’s not probably. It is THE BEST trans gm ever produced
The best.
Thanks for the video. Great info. I have a TH400 in my 68 Grand Prix. My second to third shift is way too early. I want to get it to be much longer and stronger shift. Would this be a governor adjustment /rebuilt or vacuum modular adjustment?
You are on the right track. I would start by going to the TH400 section of the Crankshaft Coalition website and perform the auto shift valve body mods first. A adjustable red stripe modulator turned in a few turns helps as well. Governor springs can adjust WOT shifts.
try a 02xx 400r trans i bet y would love it plus u can get them out of heavy trucks or motor homes stock good to 800 hp i get all mine for free .stock they make the perfect trans for the street
if you cut a case to put a different bellhousing on it how much power can it hold with the new bellhousing?
That question is debated on the forums, but plenty. Somewhere around 2000hp maybe time to think about an aftermarket case.
Would you suggest a bigger/better cooler if I think I’m spitting a good amount of fluid out of the vent. Or adding a overflow tank?
Overflow tank is always a good idea, fluid out the vent should not be a common occurrence but does happen. A bigger cooler is also a great idea.
@@mountainsgarage thanks learning all this stuff as I go! I’ll start with a catch can for now just for the safety, but ive notice it only seems to puke out when I’m going up a bridge after driving the highway for a while. leads me to believe I’m getting the trans hot after watching ur video. Running a derale cooler so I’ll double check all that.
Rebuild kits, any recommendations for an 88’ TH400?
For the money ($150) the Jegs kit has both bands, Raybestos clutches, and a full bushing kit.
Lots of kits are not complete.
Great info, and I love all the videos really true and informative.
Approx. how many miles can you get out of a TH400 from factory in a daily driver before rebuild needed?
Hundreds of thousands of miles.
It will probably start leaking first.
@@mountainsgarage thanks. You mean like 200K miles or more?
@@robrobster9148 Yes!
@@mountainsgarage okay, so 300K is also a possibility? When driven daily and serviced well over time.
Great video..where are located at ?
Maine, you?
@@mountainsgarage Tennessee
You got it! (another subscriber). Enjoyed the vid.. Thanks for sharing.
Hi, what can you tell me about the TH400 Switch Pitch. I have one from an old caddy and have a chev case to swap the parts. Any issues in doing this and how much torque with the variable vanes take?
thanks
I haven’t even seen one of those in decades!
I have read about using them online but can’t claim to know any useful info, sorry!
@@mountainsgarage Hi, at one time Prostreet was popular and it was transmission of choice. Rare unit found in BOP &Cadillac 64' -67'. I have a 3rd gen Camaro with a Dart based 421 for fun sales. Gonna try it. If that doesn't work I'll try a Steel Glide I have. Anyways, I subscribed so keep the info coming. Peace.
Pro Street is making a comeback!
I've always liked the CSR scatter shields. They fit a lot tighter to the case but are more work to trim and install.
They are ok but I like the ultra bell instead of using the ome bell
Do you offer built transmissions? I’m looking for a built 400 with a brake.
Are you local to Maine?
@@mountainsgarage no unfortunately. I’m located in Wisconsin. I do have a guy that can build me a 400 but ‘he don’t do heavily built 400’s often’…… and I don’t really want to pay some of these prices as some shops want. I just want a built 400 that won’t break the bank….I’m not afraid of spending money but I just don’t get a good feeling from a couple places around me. I’ve watched a bunch of your videos and you obviously know your stuff. I did join that DIY th400 page on Facebook today. I’m building a Chevy colorado with a turbo 6.0 in it. I’m expecting 900 or better with the turbo I have. I know nothing about rebuilding transmissions and I have no interest in experimenting either. Just need to find a honest builder or something. Or just a parts list and I’ll just get it done by me. I appreciate any help. I’m just afraid I’ll be taken for a ride at my local shop….. kinda sad isn’t it? Of course I want a trans brake. ATD I think I was set on.
@@daviddenman7479 Well ATD is also in Wisconsin and they build fine transmissions. In my playlist I have a recipe for that power range so you will have an idea what you need.
@@mountainsgarage I live like 45 minutes from them. I looked them up and they seem to offer some great choices. Thanks for the info!
Excellent video sir! Just one question if I may. Would you say that the earlier 70’s th400 used in commercial chassis cars were straight cut gears?
Looking at the history of the 475 it only says they were installed starting in the early 70’s. So long story short I don’t know but will make it a quest to find an older unit and find out!
thanks for the help on adjusting the vacuum modulator. good stuff, keep up the good work
what u want to start with is a 02xx 400r turbo stock they are good to 800 hp they came with the bigger pump heavy clutches stage one shift kit with a few other up grades . u can find them in heavy trucks and motor homes this is what u want to start with gm crate trans it will have 02xx welded on the bell housing . plus u can get them for free last year i got 4 crate set ups with the 454 450 hp with the 02xx trans from 6,000 to 58,000 miles on them all for free .gm calls them street strip or heavy applications trans
Bolt,washer and spacer that slids on before filter
Hey thank you for the video. Do anyone tell you that you sound like the Captain of the Orca in the movie JAWS. GOOD STUFF 👍
Now I need to rewatch that!
Thanks!
Sweet clamp you got there
The th400 from behind a 6.2 diesel a good performance candidate? Its a very low mileage unit. 20k. Plan to use a Ultrabell and manual valve body.
The dirty transmission in the video came from a 6.2 3/4 ton truck.
@@mountainsgarage thank you
I’m running a th400 trans with straight cut gears; what gear ratio did Gm offer , I was told by a previous owner that it had a 2.10 first gear is that possible
All the GM transmissions were 2.48, but aftermarket ratios are available in 2.10.
Where are you located
What is your favorite pan gasket material for no leaks?
It’s hard to beat dry cork.
What is better the turbo 350
does a th400 bell housing bolt up to 5.3?
Austen Loan Yes but the middle passenger side bolt can’t be used because it doesn’t exist in the block.
I install a Helicoil in the vacant hole in the transmission case
to mount the dipstick or transmission shield.
Is this guy from Boston?
Further North than that!
I have 6 of these that came with the house I bought but I dont need them does anyone know about how much they go for? they are all good.
If they aren’t full of water they go fo $2-300 each. If they have been store outside probably not worth much.
@@mountainsgarage They have been in the shop this whole time. The guy I bought it from passed away and he was a mechanic. House came with 3 big blocks and 4 small blocks and 2 c10s with big blocks lol so keeping some stuff to finish and selling the rest. thank you for the info! they look to be in good condition with tags ready to go.
@@mountainsgarage shot ya a sub! Keeping one of the 400s for the big block c10 and gunna sell the rest
@@its_evers6445 Thanks!!
You did get into talking about the switch pitch th400, why?
I haven’t seen one in so long! Even in the 7 years working in transmission shops I think I saw one.
Trying to find any information on any TH-cam channel. Wanted to know what all i can upgrade and still keep my switch pitch internals and hold 1200hp. Most of the poeple on here want to keep them on factory stock engines(425 olds or 500 cad). I've got the Reid case with ls style bell that I'm dying to convert.
I've got two oldsmobile th400 with switch pitch.
I believe Phoenix Transmission in Texas builds converters for them, and sells all the parts to convert a normal TH400.
@@mountainsgarage I'll look into them. Thank, I do appreciate that.
My turbo 400 shifts out of 1st at 5200 I need it to be at 6500 it came out of a 1990 c2500 anybody know what I need to do
straightedgecmp Yes you need to remove that safety feature built into a TH400. It requires a few mods in the valve body, pretty simple. Lots of info online. A shift kit will also address the situation.
Mountains Garage thanks I appreciate it should I go with trans go?
Thanks for the answer
13:19 Three or four thousand horsepower DAM. I have yet to see that.
At what level does the input and output shafts need swapped out?
Popular opinion on input shaft , depending on weight, seems to be 8-1200hp.
Output maybe twice that.
Pretty amazing units!