Its AWD, almost the same setup as a Subaru. I know you mentioned one of the other NV transfer cases has a Torsen center differential, is that your ultimate goal?
that viscous coupler will lock solid once it does. we had a 8 foot snipe and multiple guys hanging off it in automotive school even though they claim it divides the power 70/30.if you notice it will lock up on you in parking lots from turning and the difference in wheel speed front to back.anyway I daily drove an ss silverado for 9 years in the canadian snow and slop. best AWD system ever
Not a truck guy but I don't think a viscous coupler should ever actually lock up. They can transmit one hell of a lot of torque if you try to turn their two against each other fast, though. But my understanding of the things is "at some slow enough speed they will permit two shafts to be rotated independently." If it doesn't I'm guessing there must be some unwanted metal-to-metal contact of the parts inside.
Top notch video yet again sir!! Love how you kinda joke about the naysayers but yet explain it in full detail. Watched this video with my 4 month old and he was all about it and the music helps keep his attention. We were rooting for you when putting the case back together and watching that snap ring.
An AWD transfer case with a slightly under driven low range would be cool. You could run a taller gear in the axles for MPG while driving around town. Then shift it into low range for the track.
not sure what the original comment was but in general awd means that the front and rear drive shaft can move independently of one another, this can be done with a diff and with or without a viscous coupler. 4wd meaning they are locked together, either permanently or with a locking center diff. a couple interesting tcases: 2001-2002 toyota 4runners came with a multimode tcase that can do rwd, awd, and 4wd. In the 80's toyota made a 4wd version of the tercel. The engine is mounted longitudinally, the transmission mounts like a rwd transmission but has a shaft that goes forward to an integral center mounted front diff that sits under the engine. There is a locking collar on the rear end of that shaft that locks into the rear output for the rear solid axle. It operates as a part time 4wd system with a fwd primary mode, it also has 6 speeds, with an extra low gear being a 4.7. diffs are geared 4.10.
LT…I just found this channel. I remember LT from Powernation. Seems like a nice channel here, so I subbed up. I have to mention how impressed I was watching the video and seeing LT use hearing protection like he did. People do not realize how easy it is to damage your hearing and how easy it is to protect against it. Kudos!!
Spent a lot of time around machine rooms ( retired elevator man here) … the time I spent around those high pitch generators !!! I wish I could go back n time n wore ear protection … best to this channel . New subscriber here. I have seen some of your videos… we have owned bunch of these 99 to 2007 ( and before n beyond) Chevys . ( three daughters used em in H/S n college too)… I just maintained them ,, no racing ( though I heard stories bout the youngest) . Our most favorite was a 2003 short bed regular cab 4.8 that I bought with 130 k miles and three years old . .. sold it at 385 k miles 13 years later ( same engine replace trans with a new one at 175k) for same 8 k I paid for it.
Well it is all wheel drive. And it’s one of the best projects out there in TH-cam land! I primarily drag race but I do love interesting street projects! So now I have to build a street project! Thanks a lot LT see what you started😎
Sorry, but something just makes me smile when I see the TV guy with that big fancy shop they had working on the floor bathing in fluids just like me. :)
You you know of a transfer case that has a 2wd or Awd options I the np 242 kind of does in the full time Selection. But I think it just had a differential in xfer case no viscous coupler Or a combo of 2 that would achieve those results
Look up family man racing or something like that and his . Ls turbo AWD 3000gt I think his was a locked case and switched to rwd by Colorado electric disconnect front axle And I've heard of guys combineing gm new process cases with the jeep 231 but 242 might be doable too I've got one in my zj haven't used the AWD much I've got a lunch box ratchet locker in the front so it don't like turning much
I'm very interested in what you're doing here because in a few years when I sell my 2018 Denali 6.2 I'm considering finding another 2001 C3 which was my favorite truck and doing a mild 500 whp LS3 in it unless the newer Colorado turbo can be made to hit 400whp easy enough. Watching!!!
I had a 2004 Tahoe with that transfer case. Actually was a beast in the snow and it was great for my wife because you know it didn't blow sideways as easily as a truck in two-wheel drive. Still did all-wheel drive donuts though. It's only the 5'3 and it had that that auto ride BS but the thing had 230,000 mi on it and it was a high output. Aluminum 5.3 not the LM for the other one... It only had like 2,000 hours on it. It was all highway I averaged sold it. It was like 65 mph average. It looks like a brand new 2000 Ford Tahoe. I ended up selling it to my cousin cuz he was in a pinch and he still drives it. It has 287,000 now I believe same original everything except for rear end. It did end up blowing a rear end. I think he was beating on it.... Dorothy never let me down
I never had a 4 wd or AWD,,, my had bunch of SWB full size Chevys though … when my oldes went off road (unintended ),,, I made rule about keeping 4-500 lbs of elevator counter weight up against the cab in the bed… AND got into flipping new take off wheels and tires so that I would always have a newish set of tires on those trucks. Thankfully no more ‘off roading’. ( and they shure rode nice). So we always had rear drive Chevys ( wife and 40 years) .. we talked a lot about what fun retirement car we would like ( in our first few years of marriage I bought n repaired a wrecked 69 impala SS 427 convertible, and family car was a 70 Monte Carlo ( this transplanted rust belt boy loves Georgia rust free cars!!) Our fav truck was a 03 that we put over 250 k miles on ( after buying used with 130)… So after I retired I bought a low mile ( just under 29,000 miles) … o3 silverado shorty 5.3 .. as third vehicle… I don’t use it much.. ( I find it difficult to put the miles on) ( a ‘problem’ that I didn’t give much thought to before buyin lol)
It absolutely kills me how freaking confident you are putting all the gears and seals back together in the transfer case. Like you’ve done it a million times already.
Haven't commented in a while. But here I am. Been watching and waiting. I gotta say your definitely starting to develop your TH-cam personality. Don't know if you remember my last comment. Lol loving the channel a lot. Keep on doing what your doing. Kinda weird but I'm proud of you. As always be good do good.
I'd suggest a 100 watt spotlight lightbulb and 3 drops of 3 in one oil for heating. The bulb placed over the bearing and the oil when it throws off a little smoke will tell you when the bearing is hot enough. Built spindles for cnc machines that way.
Ya when I put another used transfer case in my Silverado I went back witha case saver which was just a piece of stamped steel that distributed the load more
As someone else said that's how Subaru does it. The viscous coupler is essentially like a small torque converter, and they are, as well, usually not rebuildable. You can get full lockup in a torque converter, a percentage of lockup, in the transfer case or at the input to the transmission. GM was savvy enough to use a viscous coupler to create their desired ratio of front-to-rear bias. This can be changed just like a lockup torque converter in a drag car. This setup is found is Mercedes , BMW, Acura, GM, Ford, every manufacturer -not only in the transfer case but the transmission. The only difference is using fluid dynamics to couple rather than mechanical/ positive lock through a gear or a chain. Physics 101. Yes, it's AWD.
The bias does not come from the viscous coupler, it comes from the planetary differential (see patent# US4677873A if you are curious!). Subaru 5MT uses an 1:1 spider differential, which is why it's 50:50. (Some!)6MT use a planetary differential more similar to the NP/NV transfer cases with a few different ratios used depending on the year/application which is why you see everything from 49:51 to 35:65 bias listed for those. This is all independent of viscous vs DCCD. In both cases, the front and rear ends are still mechanically linked. All the viscous coupling does is provide a somewhat speed sensitive restriction on how much differential action happens. One inaccurate way it's described is that it has a theoretical range of 40:60 (fully open) to 50:50 (fully locked) . But since technically a fully open center diff can be 50:50 and a fully locked center diff is ALSO 50:50, torque bias obviously doesn't tell the whole story!
When I rebuilt my 241 I didn't know that about the front seal so I beat it in the case with a huge socket I believe. Lol 40k miles and still not leaking.
Use welding pliers to spread that ring when u put the housing back on where that rubber peace goes back in and use a flathead screw driver n the speedometer to lift it up to the ring on the bearing the welding pliers dont slip and spreads wider and it pushes right up with a flathead screw driver through the speedometer
3:18 *phew* thank goodness you have a cat on it! Lol awesome build dude! Looking to get me a work truck. But just in case my truck doesn’t have one, I’ll make sure to check out your channel so I can swap in an NV149 🤘🤘🤘🤘🤘
the NV149 has a viscous coupler, acting "like" a differential but is not a differential. The NV120 from the trailblazer SS has a centre torsen differential and would honestly be a better performance option. i think the front diff on the TBSS is torsen also.
@@gootch27 it won't lock solid as it's a fluid coupler, if it did lock solid, one would not have to replace the burned out coupler as was done here. The TBSS is a torsen which is developed uniquely for performance. Just like in the Nissan skylines, most rally cars and so on. The 149 is a city transfer case for urban vehicles.
The pump body is the cause, as it hammers into the case and because the case is aluminum it just eats through it eventually. For 800 dollars I hope they didn't forget to put a 17 dollar part in it that will probably prevent you ever spending that amount of money again.
i know ya done got it back together, but it'd be awesome if ya did a video recap with pics or something on the parts that gives the case a 60/40 ratio, n do you know if it can be converted to a 50/50 ratio? me and my husband have been working on a project similar to yours, its just that ares is a manual, an he works so much he dont got alot time, so i do alot of the research. recently iv been looking into mating a tremec 6speed to a 4x4 transfer case, an we might even change are minds an go with a nv149 cause how well you done! GREAT job by the way! my husband loves your channel an your work! we are huge fans, even when ya was on power nation!
I thought the 149 was only in the Silverado ss? And the Denali, Escalade & trailblazer ss used a different transfercase? We use the 149 in our syclone builds, but behind an L83 with a blower.
it was best known for being used in the Silverado SS, but SOME denali's and escalades used it as well in the 2001 to 2004 range. however, they also used a Borg Warner AWD case in the other denalis and escalades along the same time, and those used an open center diff which wasn't as good as the NV149
What did I miss? How is the 60 rear 40 front torque split accomplished? I have seen differentials where the tumbling spider gears' turn on an axis NOT 90 degrees to the output shafts - and that allows the side gears to be different sizes. I want a closer look at that 60/40 differential's spider gears, Lawrence.
@@bradley3549 Thank you - I am familiar with differentials using straight-cut gears but only from low power stuff like lawn equipment and gold carts. I didn't know the were ever used on heavier stuff. Be cool to see that took apart and explaiined !
@@patrickshaw8595 They aren't necessarily always straight cut either, helical planetary differentials also exist. Usually not because of noise but because the thrust characteristics of the gears allow for limited slip. Which is how some 'gear type' LSDs work. What I like so much about the planetary differential is that it's REALLY hard to unpack what's going on with them. Probably one of the best brain teasers in the automotive world. Tricky especially since there are different types that work in different modes. You can drive the sun and get differential action from both ring gears. Or you can drive the ring gear and get action from two sun gears. Or you can drive the ring gear and get action from BOTH the sun and the plantetary gears. Can make your head explode. And to make matters worse, most TH-cam videos either grossly simplify it because it's hard to understand OR are flat out incorrect. :(
@@patrickshaw8595 OOH! And something else that's really neat - a lot of planetary center differentials tend to be something other than 50:50 torque split. But it's NOT necessarily because it's better! It's often because you can make the differential 1/3rd more compact and likely inherently stronger by having a non-equal ratio! It's all about packaging.
@@bradley3549 Lifelong fascination 3-shaft transmissions here. Coupling two of them together - well let me go through my personal library and when I find it I will recommend a book to you wherein the author created a special symbolic language just for the purpose of describing coupled planetaries ! Point is I am an expert. No stranger to compact harmonic drives and zillion-to-one ratio compound planetaries in winches, hoists and power-rearview-mirror adjusters. Any automotive differential is a "negative-one-to-positive-one" reversing gearbox and it's normal power flow is to tumble the transmission CASE ( a planetary gearbox ) and the torque component of power is split exactly in half going to each shaft while the rpm is usually intended to be constrained by driven rubber tires and their path -straight or curved- along a roadway. The point of ^that^ was that you already knew that AND also how a Torsen diff uses worm gears and worm wheels to affect the normally even split. So i hear you describe your truck's power divider in the abstract as: "a gearbox of negative-1.6-to-positive-1.4 ratio so constructed as to be driven by it's case - making it a planetary - and also not utilizing bevel gears, chains or cardan shafts for it's purpose ~ but rather stepped helical planetary gears (sounds kind of PowerGlide-ish!) pinioned to orbit their unequally-sized sun gears (shades of Model T Ford steering reduction gears !) Hope you got a laugh out of this and don't feel slighted. Once back in the 50s I worked on a team at Fairchild to design a compound planetary prop-speed gear-reduction unit for their little-bitty gas turbine. It was a failure. Too inefficient. Too much "recirculating power" and it was replaced by conventional staged spur gears. Seriously I'll locate that old book, dite it to you - then you can read it and be as confused as I am by the whole subject, lol !
love the info, got a question for u tho... the adapter housing on the trans that goes to the transfercase, do they sell those (had no luck finding one) or do i need to pull one from a junk yard?
Gotta love internet trolls that have no bearing (no pun intended) on what you are doing. As a famous philosopher once said, "They hate us cuz they ain't us"
@@LawrenceTolman it's only awd if the wheels are all on the ground LOL got to love waiting for parts .. my CJ7 dropped the rear drive shaft going down main st about 20 mph . at night so no traffic . picked up the drive shaft ,, put jeep in 4wd drove home front wheel drive .. yokes had the strap clamps they bent .. also broke the strap bolts and bent a few .. they were tight 2 days before I checked .. had the tranny out 400 miles ago .. 10 days of waiting the company said they do not stock the yoke any more .. ordered another one 2 days later jeep driving .. I need to rebuild the warner t5 5 speed tranny ,, that's another story ..
AWD, interesting, always wondered how they worked... I just bought a 2005 Silverado 6.0 2500HD 4x4 with the GM 4L80. I REALLY Want a 5 Speed without a Granny Gear that could handle some HP and Torque Upgrades.
Good Day to you Sir. I've located diffential/transfer case for my 2014 silverado 1500 5.3L z71 lt conversion. What else do I need to pick up. Love your channel.
looks like 10325... they don't list the NV149 for this application, but it shares the same seal with the other cases this works for... worked perfect for me
Ex wife's land Rover discovery ll front differential went out. We tried to pull the drive shaft to run it in RWD. Wouldn't move an inch. Not familiar with awd or land Rover but we just sold it. The head gasket was fried anyway
If i remember right theyre proper awd with a center locking diff for 50/50 split and i think regular axle differentials as well depending on options. Mightve moved if you hit the center diff lock but probably wouldve strained the center diff real bad anyways
so...im curious. Youre obviously very into the idea of all wheel drive. But why? does it have benefits over the 4 wheel drive setup? or the auto function on the gmt800? other then never needing to manually change it of course. But is it any better? or just convenience?
for most drivers, 4wd would be the way to go, but I love the idea of it being there all the time, and for drag racing and autocross specifically. (the AWD system helped this truck win the speed/stop challenge at LS Fest West). The auto 4x4 setups need to first senst slip and then engage, where the AWD system is already there and requires no electronic input to activate.
Ah ok. Racing applications are something that did not occur to me lol which i did notice the headers so im not sure why lol but makes sense. Thank you.
I'm not really into all the nuances of gm power trains but an all wheel drive transfer case does not make an all wheel drive vehicle. My definition is if all four wheels pull at all times. Back in the 70s and early to mid 80s gm sold a lot of four wheel drives with open diffs. front and rear meaning even in four wheel drive, high or low at best you had two wheels pulling. And back then I did not see them as four wheel drives.
I dont know how much a bearing heater would cost you but man does it make outting bearings a whole lot easier just make sure you dont go over a certain temperature range i think like 250 f° and u will be good
OK guys, what's the vote? Is it really AWD? Most wheel drive? Sort of 4wd? or just plain cool...
Its AWD, almost the same setup as a Subaru. I know you mentioned one of the other NV transfer cases has a Torsen center differential, is that your ultimate goal?
@@jaredhuang2225 awd is awd whether it's engine and trans layout are RWD (Chevrolet) or FWD(Suzuki, Subaru etc)
The center diff distributes the power all the time to all 4 wheels. That’s all wheel drive.
AWD similar to Audi Quattro and Subaru and Mercedes 4 Matic and BMW x drive and all the other big name AWD systems
Awd
that viscous coupler will lock solid once it does. we had a 8 foot snipe and multiple guys hanging off it in automotive school even though they claim it divides the power 70/30.if you notice it will lock up on you in parking lots from turning and the difference in wheel speed front to back.anyway I daily drove an ss silverado for 9 years in the canadian snow and slop. best AWD system ever
They can prematurely lock the front in 100 degree + weather while turning. Had it happen a lot in a AWD safari in the Texas heat.
@@shyecjj Must've been a 2nd gen. First gens are chain drive.
Not a truck guy but I don't think a viscous coupler should ever actually lock up. They can transmit one hell of a lot of torque if you try to turn their two against each other fast, though. But my understanding of the things is "at some slow enough speed they will permit two shafts to be rotated independently." If it doesn't I'm guessing there must be some unwanted metal-to-metal contact of the parts inside.
@@patrickshaw8595 They don't lock up intentionally, I think they mean more of a soft sieze.
@@ItsDaJax Hmmmm. The silicone fluid is supposed to get thicker with higher temps. Maybe it's something like that.
Congrats on 80,000. Best show on TH-cam by far. Can’t wait to get the new trans in.
Top notch video yet again sir!! Love how you kinda joke about the naysayers but yet explain it in full detail. Watched this video with my 4 month old and he was all about it and the music helps keep his attention. We were rooting for you when putting the case back together and watching that snap ring.
An AWD transfer case with a slightly under driven low range would be cool. You could run a taller gear in the axles for MPG while driving around town. Then shift it into low range for the track.
When working, this AWD system works fabulous in the snow, even off road.
not sure what the original comment was but in general awd means that the front and rear drive shaft can move independently of one another, this can be done with a diff and with or without a viscous coupler. 4wd meaning they are locked together, either permanently or with a locking center diff. a couple interesting tcases: 2001-2002 toyota 4runners came with a multimode tcase that can do rwd, awd, and 4wd. In the 80's toyota made a 4wd version of the tercel. The engine is mounted longitudinally, the transmission mounts like a rwd transmission but has a shaft that goes forward to an integral center mounted front diff that sits under the engine. There is a locking collar on the rear end of that shaft that locks into the rear output for the rear solid axle. It operates as a part time 4wd system with a fwd primary mode, it also has 6 speeds, with an extra low gear being a 4.7. diffs are geared 4.10.
Thanks for the information on the rebuild of the AWD system. Nice garage you have
thanks!
What a job! It’s a pleasure to see the prolixity of your work!
LT…I just found this channel. I remember LT from Powernation. Seems like a nice channel here, so I subbed up.
I have to mention how impressed I was watching the video and seeing LT use hearing protection like he did. People do not realize how easy it is to damage your hearing and how easy it is to protect against it.
Kudos!!
Spent a lot of time around machine rooms ( retired elevator man here) … the time I spent around those high pitch generators !!! I wish I could go back n time n wore ear protection … best to this channel .
New subscriber here. I have seen some of your videos… we have owned bunch of these 99 to 2007 ( and before n beyond) Chevys . ( three daughters used em in H/S n college too)… I just maintained them ,, no racing ( though I heard stories bout the youngest) .
Our most favorite was a 2003 short bed regular cab 4.8 that I bought with 130 k miles and three years old . .. sold it at 385 k miles 13 years later ( same engine replace trans with a new one at 175k) for same 8 k I paid for it.
The 8.25 front diffs are built pretty tight and will pull both front wheels majority of the time
You can get a Tru trac in the 2500hd fronts. Thats my goal. Tru Trac front and back in 4x4 💪
Great video! Thanks for the detailed look at rebuilding the awd transfer case!
Well now I'm really excited for your next upload after what you mentioned cleaning up the output shaft!
I have that Missing bearing LT...i can send you a pic of that bearing in an email if you need it.
dang, too late. the case is already together, and besides, it actually didn't look bad at all so I didnt mind reusing it
I always get trans fluid between the trans and center diff as well. I also forget to have a pan ready every time too!
I had a pan under there, but most of the fluid missed it lol
Nice work. Looking forward to seeing the big block content. I always ran big block Chevys in my jetboats.
I live in Utah also love the rain here too
Looking forward to seeing the upcoming Ugly Truck content!!! Keep up the great work LT!!!
awesome to see the progress
Great videos as always. I love all the progress you make with these trucks!
I’m curious. How much hp will the np149 hold? I’m working on a not awd build myself
LT send some of that rain to Texas, thanks for the detailed videos.
Great Video buddy! Miss you from trucks! And great info. Thanks.
Cool..nice truck.My blazer was full time 4 wheel drive..
Well it is all wheel drive. And it’s one of the best projects out there in TH-cam land! I primarily drag race but I do love interesting street projects! So now I have to build a street project! Thanks a lot LT see what you started😎
hey thanks a ton!
The NV149 was in some of the Silverado SS's (I had one) and they were full-time AWD.
WPC and cryo treatment would be an awesome touch to the rebuild.
Sorry, but something just makes me smile when I see the TV guy with that big fancy shop they had working on the floor bathing in fluids just like me. :)
Awesome videos, love the detail you go into these videos and can't wait to see new motor for ugly truck.
You you know of a transfer case that has a
2wd or Awd options
I the np 242 kind of does in the full time
Selection. But I think it just had a differential in xfer case no viscous coupler
Or a combo of 2 that would achieve those results
Look up family man racing or something like that and his
. Ls turbo AWD 3000gt
I think his was a locked case and switched to rwd by Colorado electric disconnect front axle
And I've heard of guys combineing gm new process cases with the jeep 231 but 242 might be doable too I've got one in my zj haven't used the AWD much
I've got a lunch box ratchet locker in the front so it don't like turning much
I'm very interested in what you're doing here because in a few years when I sell my 2018 Denali 6.2 I'm considering finding another 2001 C3 which was my favorite truck and doing a mild 500 whp LS3 in it unless the newer Colorado turbo can be made to hit 400whp easy enough.
Watching!!!
I had a 2004 Tahoe with that transfer case. Actually was a beast in the snow and it was great for my wife because you know it didn't blow sideways as easily as a truck in two-wheel drive. Still did all-wheel drive donuts though. It's only the 5'3 and it had that that auto ride BS but the thing had 230,000 mi on it and it was a high output. Aluminum 5.3 not the LM for the other one... It only had like 2,000 hours on it. It was all highway I averaged sold it. It was like 65 mph average. It looks like a brand new 2000 Ford Tahoe. I ended up selling it to my cousin cuz he was in a pinch and he still drives it. It has 287,000 now I believe same original everything except for rear end. It did end up blowing a rear end. I think he was beating on it.... Dorothy never let me down
You cracked 80k subscribers. You should make 100 before end of year.
I hope so!
I never had a 4 wd or AWD,,, my had bunch of SWB full size Chevys though … when my oldes went off road (unintended ),,, I made rule about keeping 4-500 lbs of elevator counter weight up against the cab in the bed… AND got into flipping new take off wheels and tires so that I would always have a newish set of tires on those trucks. Thankfully no more ‘off roading’. ( and they shure rode nice).
So we always had rear drive Chevys ( wife and 40 years) .. we talked a lot about what fun retirement car we would like ( in our first few years of marriage I bought n repaired a wrecked 69 impala SS 427 convertible, and family car was a 70 Monte Carlo ( this transplanted rust belt boy loves Georgia rust free cars!!)
Our fav truck was a 03 that we put over 250 k miles on ( after buying used with 130)…
So after I retired I bought a low mile ( just under 29,000 miles) … o3 silverado shorty 5.3 .. as third vehicle…
I don’t use it much.. ( I find it difficult to put the miles on) ( a ‘problem’ that I didn’t give much thought to before buyin lol)
Small suggestion, get a cheap French fryer for the shop. Makes installing bearings and gears super easy. They fall on and shrink fit.
Rock on LT do what you do never mind people's wrong opinions you'll get a sore neck from shaking your head too much
Awesome, can't wait for next video.
It absolutely kills me how freaking confident you are putting all the gears and seals back together in the transfer case. Like you’ve done it a million times already.
we'll see how that confidence works out once we try and drive it lol... it might end up sounding like a rock crusher
@@LawrenceTolman hahaha at least you know it was built with love ♡ ♡ ♡
Haven't commented in a while. But here I am. Been watching and waiting. I gotta say your definitely starting to develop your TH-cam personality. Don't know if you remember my last comment. Lol loving the channel a lot. Keep on doing what your doing. Kinda weird but I'm proud of you. As always be good do good.
I'd suggest a 100 watt spotlight lightbulb and 3 drops of 3 in one oil for heating. The bulb placed over the bearing and the oil when it throws off a little smoke will tell you when the bearing is hot enough.
Built spindles for cnc machines that way.
I enjoy how all hydraulic presses sound the same when they are released
Love how you’ll never catch LT in a lie, you can see it’s all showing issues and outcomes
Ya when I put another used transfer case in my Silverado I went back witha case saver which was just a piece of stamped steel that distributed the load more
Great video I have a mechanic doing a 4l80 swap for me .. I'm waiting the 32 spline input adapter
As someone else said that's how Subaru does it. The viscous coupler is essentially like a small torque converter, and they are, as well, usually not rebuildable. You can get full lockup in a torque converter, a percentage of lockup, in the transfer case or at the input to the transmission. GM was savvy enough to use a viscous coupler to create their desired ratio of front-to-rear bias. This can be changed just like a lockup torque converter in a drag car. This setup is found is Mercedes , BMW, Acura, GM, Ford, every manufacturer -not only in the transfer case but the transmission. The only difference is using fluid dynamics to couple rather than mechanical/ positive lock through a gear or a chain. Physics 101. Yes, it's AWD.
The bias does not come from the viscous coupler, it comes from the planetary differential (see patent# US4677873A if you are curious!). Subaru 5MT uses an 1:1 spider differential, which is why it's 50:50. (Some!)6MT use a planetary differential more similar to the NP/NV transfer cases with a few different ratios used depending on the year/application which is why you see everything from 49:51 to 35:65 bias listed for those.
This is all independent of viscous vs DCCD.
In both cases, the front and rear ends are still mechanically linked. All the viscous coupling does is provide a somewhat speed sensitive restriction on how much differential action happens. One inaccurate way it's described is that it has a theoretical range of 40:60 (fully open) to 50:50 (fully locked) . But since technically a fully open center diff can be 50:50 and a fully locked center diff is ALSO 50:50, torque bias obviously doesn't tell the whole story!
Awsome content, thanks for showing us
That assemble goo is great. Highly recommend.
When I rebuilt my 241 I didn't know that about the front seal so I beat it in the case with a huge socket I believe. Lol 40k miles and still not leaking.
...again "GREAT and INFORMATIVE video...Do you have the info on the input shaft needed to do the 4L80e swap ?
Your lawns are so green, you have no idea what a drought is.
@ 3:16 what clamps are those to hold the cats in place ?
you held a clinic with that press
We need some of that rain in northern Indiana.
Use welding pliers to spread that ring when u put the housing back on where that rubber peace goes back in and use a flathead screw driver n the speedometer to lift it up to the ring on the bearing the welding pliers dont slip and spreads wider and it pushes right up with a flathead screw driver through the speedometer
I really like this truck!
All wheel drive. Done ✅
Could you post some links to where you got that input shaft for the transfer case? Along with the oil pump upgrade? I would appreciate it thanks
I had to put a shift fork in a np208 transfer case 30 years ago and from what I remember it was way more complicated inside then that one
Having 2wd/4hi/4lo requires a lot of extra moving parts, that's for sure!
3:18 *phew* thank goodness you have a cat on it! Lol awesome build dude! Looking to get me a work truck. But just in case my truck doesn’t have one, I’ll make sure to check out your channel so I can swap in an NV149 🤘🤘🤘🤘🤘
the NV149 has a viscous coupler, acting "like" a differential but is not a differential. The NV120 from the trailblazer SS has a centre torsen differential and would honestly be a better performance option. i think the front diff on the TBSS is torsen also.
the 149 is a much better option. it will lock solid and they are tough
@@gootch27 it won't lock solid as it's a fluid coupler, if it did lock solid, one would not have to replace the burned out coupler as was done here. The TBSS is a torsen which is developed uniquely for performance. Just like in the Nissan skylines, most rally cars and so on. The 149 is a city transfer case for urban vehicles.
Have you seen the case saver for the pumps that replace the old anti-rattle clip in the case for the pump.
Damn I need to get to work on my Yukon, I feel like everything I fix just allows the next part down the line to break.
I've seen people modify their parts washer with a car filter it's really neat maybe you should think about that
I thought about that, but never got around to doing it. would be a good idea though.
I think I had that wear thru on my 03 1500 xfer case. Had it repaired for 850.00. They also replaced the case , not sure if they got the cause.
The pump body is the cause, as it hammers into the case and because the case is aluminum it just eats through it eventually. For 800 dollars I hope they didn't forget to put a 17 dollar part in it that will probably prevent you ever spending that amount of money again.
i know ya done got it back together, but it'd be awesome if ya did a video recap with pics or something on the parts that gives the case a 60/40 ratio, n do you know if it can be converted to a 50/50 ratio? me and my husband have been working on a project similar to yours, its just that ares is a manual, an he works so much he dont got alot time, so i do alot of the research. recently iv been looking into mating a tremec 6speed to a 4x4 transfer case, an we might even change are minds an go with a nv149 cause how well you done! GREAT job by the way! my husband loves your channel an your work! we are huge fans, even when ya was on power nation!
Wait what the motor?!!! Did not see that coming
Did you custom make that clean station? that's dope
I thought the 149 was only in the Silverado ss? And the Denali, Escalade & trailblazer ss used a different transfercase? We use the 149 in our syclone builds, but behind an L83 with a blower.
it was best known for being used in the Silverado SS, but SOME denali's and escalades used it as well in the 2001 to 2004 range. however, they also used a Borg Warner AWD case in the other denalis and escalades along the same time, and those used an open center diff which wasn't as good as the NV149
I’m loving the new thumbnails you’ve been using lol
trying to mix it up!
Hello LT! AWD Extremely cool! 😎
Hey, thanks!
do you like that Trans jack?
Build a bearing installer kit? Brand?
It'd be nice to see an awd obs conversion with all your current knowledge
I did one already actually… look up project redtide from my PowerNation days.
@@LawrenceTolman im literrally watching it right now lol. Sorry
What did I miss? How is the 60 rear 40 front torque split accomplished? I have seen differentials where the tumbling spider gears' turn on an axis NOT 90 degrees to the output shafts - and that allows the side gears to be different sizes. I want a closer look at that 60/40 differential's spider gears, Lawrence.
This uses a planetary differential rather than a spider differential. And the sun gears are slightly different diameter to provide the torque bias.
@@bradley3549 Thank you - I am familiar with differentials using straight-cut gears but only from low power stuff like lawn equipment and gold carts. I didn't know the were ever used on heavier stuff.
Be cool to see that took apart and explaiined !
@@patrickshaw8595 They aren't necessarily always straight cut either, helical planetary differentials also exist. Usually not because of noise but because the thrust characteristics of the gears allow for limited slip. Which is how some 'gear type' LSDs work.
What I like so much about the planetary differential is that it's REALLY hard to unpack what's going on with them. Probably one of the best brain teasers in the automotive world. Tricky especially since there are different types that work in different modes. You can drive the sun and get differential action from both ring gears. Or you can drive the ring gear and get action from two sun gears. Or you can drive the ring gear and get action from BOTH the sun and the plantetary gears. Can make your head explode.
And to make matters worse, most TH-cam videos either grossly simplify it because it's hard to understand OR are flat out incorrect. :(
@@patrickshaw8595 OOH! And something else that's really neat - a lot of planetary center differentials tend to be something other than 50:50 torque split. But it's NOT necessarily because it's better! It's often because you can make the differential 1/3rd more compact and likely inherently stronger by having a non-equal ratio! It's all about packaging.
@@bradley3549 Lifelong fascination 3-shaft transmissions here. Coupling two of them together - well let me go through my personal library and when I find it I will recommend a book to you wherein the author created a special symbolic language just for the purpose of describing coupled planetaries !
Point is I am an expert. No stranger to compact harmonic drives and zillion-to-one ratio compound planetaries in winches, hoists and power-rearview-mirror adjusters.
Any automotive differential is a "negative-one-to-positive-one" reversing gearbox and it's normal power flow is to tumble the transmission CASE ( a planetary gearbox ) and the torque component of power is split exactly in half going to each shaft while the rpm is usually intended to be constrained by driven rubber tires and their path -straight or curved- along a roadway.
The point of ^that^ was that you already knew that AND also how a Torsen diff uses worm gears and worm wheels to affect the normally even split.
So i hear you describe your truck's power divider in the abstract as:
"a gearbox of negative-1.6-to-positive-1.4 ratio so constructed as to be driven by it's case - making it a planetary - and also not utilizing bevel gears, chains or cardan shafts for it's purpose ~ but rather stepped helical planetary gears (sounds kind of PowerGlide-ish!) pinioned to orbit their unequally-sized sun gears (shades of Model T Ford steering reduction gears !)
Hope you got a laugh out of this and don't feel slighted. Once back in the 50s I worked on a team at Fairchild to design a compound planetary prop-speed gear-reduction unit for their little-bitty gas turbine. It was a failure. Too inefficient. Too much "recirculating power" and it was replaced by conventional staged spur gears.
Seriously I'll locate that old book, dite it to you - then you can read it and be as confused as I am by the whole subject, lol !
Looking forward to seeing that big beast of an engine!
_FMG_
Is that a lowered Toyota behind the gmc? I like it
It’s the Jean shorts for me 😂 made the whole video LT lookin 18 again
Love these videos, just subscribed!
This transfer case is looking just like the one in Touareg, Cayenne and Q7
I need my np149 rebuilt!
love the info, got a question for u tho... the adapter housing on the trans that goes to the transfercase, do they sell those (had no luck finding one) or do i need to pull one from a junk yard?
I have bought em through ebay, but amazon actually sells the aluminum GM version
Open front diff makes it most wheel drive lmao jk great build
I like this answer best because its the most correct lol... "most" wheel drive
Gotta love internet trolls that have no bearing (no pun intended) on what you are doing. As a famous philosopher once said, "They hate us cuz they ain't us"
Stuart Stogdill- the h8r.
th-cam.com/channels/92xLFLhhAKS3z57G5bSsYg.html
On the not an awd team cause you made us wait to see the new motor.
🤣😂🤣
ok, that's fair. no argument there
@@LawrenceTolman it's only awd if the wheels are all on the ground LOL got to love waiting for parts .. my CJ7 dropped the rear drive shaft going down main st about 20 mph . at night so no traffic . picked up the drive shaft ,, put jeep in 4wd drove home front wheel drive .. yokes had the strap clamps they bent .. also broke the strap bolts and bent a few .. they were tight 2 days before I checked .. had the tranny out 400 miles ago .. 10 days of waiting the company said they do not stock the yoke any more .. ordered another one 2 days later jeep driving .. I need to rebuild the warner t5 5 speed tranny ,, that's another story ..
AWD, interesting, always wondered how they worked... I just bought a 2005 Silverado 6.0 2500HD 4x4 with the GM 4L80. I REALLY Want a 5 Speed without a Granny Gear that could handle some HP and Torque Upgrades.
So on rock auto I looked up that bearing your looking for the believe it in s in the transfer case overhaul kit on a 02 caddy Escalade np 149 ?
I think you said it somewhere but, where did you get the 32 spline input?
Tim S. at Modern Muscle Salvage in Michigan
Good Day to you Sir. I've located diffential/transfer case for my 2014 silverado 1500 5.3L z71 lt conversion. What else do I need to pick up. Love your channel.
So I have 2 options. Cool just have to look @ prices. In your opinion which way would you do. And what's the 8.25
Could you post a parts list with links? Also would like to know where you get your drive shafts modified for the 4L80E. I'm doing the same swap :)
Great content man!
nice and clean and organized shop - good job!
Thanks!
Love the vids man
Do you remember the part number from the merchant automotive seal driver? I emailed them and was told they don't have one for a 149🤔
looks like 10325... they don't list the NV149 for this application, but it shares the same seal with the other cases this works for... worked perfect for me
@@LawrenceTolman awesome!! Thank you for that sir
I looks to me like you forgot to put the pump pickup sock on before joining the halves of the case.
Ex wife's land Rover discovery ll front differential went out. We tried to pull the drive shaft to run it in RWD. Wouldn't move an inch. Not familiar with awd or land Rover but we just sold it. The head gasket was fried anyway
If i remember right theyre proper awd with a center locking diff for 50/50 split and i think regular axle differentials as well depending on options.
Mightve moved if you hit the center diff lock but probably wouldve strained the center diff real bad anyways
Landrover is why.
I know this is an old video, but what’s the max horse you can put through that unit?
What about the vas sensor on the transfer case I just need exten wires from 4l80 vss?
so...im curious. Youre obviously very into the idea of all wheel drive. But why? does it have benefits over the 4 wheel drive setup? or the auto function on the gmt800? other then never needing to manually change it of course. But is it any better? or just convenience?
for most drivers, 4wd would be the way to go, but I love the idea of it being there all the time, and for drag racing and autocross specifically. (the AWD system helped this truck win the speed/stop challenge at LS Fest West). The auto 4x4 setups need to first senst slip and then engage, where the AWD system is already there and requires no electronic input to activate.
Ah ok. Racing applications are something that did not occur to me lol which i did notice the headers so im not sure why lol but makes sense. Thank you.
I'm not really into all the nuances of gm power trains but an all wheel drive transfer case does not make an all wheel drive vehicle. My definition is if all four wheels pull at all times. Back in the 70s and early to mid 80s gm sold a lot of four wheel drives with open diffs. front and rear meaning even in four wheel drive, high or low at best you had two wheels pulling. And back then I did not see them as four wheel drives.
I dont know how much a bearing heater would cost you but man does it make outting bearings a whole lot easier just make sure you dont go over a certain temperature range i think like 250 f° and u will be good