Tearing Down what I THOUGHT was an AWD transfer case

[@LawrenceTolman]

OK guys, what's the vote? Is it really AWD? Most wheel drive? Sort of 4wd? or just plain cool...

[@jaredhuang2225]

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?

[@shadowopsairman1583]

@@jaredhuang2225 awd is awd whether it's engine and trans layout are RWD (Chevrolet) or FWD(Suzuki, Subaru etc)

[@afmoa]

The center diff distributes the power all the time to all 4 wheels. That’s all wheel drive.

[@1411MEDIA]

AWD similar to Audi Quattro and Subaru and Mercedes 4 Matic and BMW x drive and all the other big name AWD systems

[@johnrupert1063]

Awd

[@gootch27]

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

[@shyecjj]

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.

[@ItsDaJax]

@@shyecjj Must've been a 2nd gen. First gens are chain drive.

[@patrickshaw8595]

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.

[@ItsDaJax]

@@patrickshaw8595 They don't lock up intentionally, I think they mean more of a soft sieze.

[@patrickshaw8595]

@@ItsDaJax Hmmmm. The silicone fluid is supposed to get thicker with higher temps. Maybe it's something like that.

[@davidfarmer]

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.

[@teaguegearhart9851]

Congrats on 80,000. Best show on KZbin by far. Can’t wait to get the new trans in.

[@tylerlathem2079]

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.

[@DustinDoesStuff]

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.

[@ramonbs6075]

What a job! It’s a pleasure to see the prolixity of your work!

[@flashgordon3715]

When working, this AWD system works fabulous in the snow, even off road.

[@BADD400]

Thanks for the information on the rebuild of the AWD system. Nice garage you have

[@LawrenceTolman]

thanks!

[@Todd66]

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!!

[@Jimthechevywheelman]

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.

[@brettsmith4962]

Great video! Thanks for the detailed look at rebuilding the awd transfer case!

[@zaustin12]

Well now I'm really excited for your next upload after what you mentioned cleaning up the output shaft!

[@InnocentMiscreant]

The 8.25 front diffs are built pretty tight and will pull both front wheels majority of the time

[@swappedoutZ71]

You can get a Tru trac in the 2500hd fronts. Thats my goal. Tru Trac front and back in 4x4 💪

[@afmoa]

I always get trans fluid between the trans and center diff as well. I also forget to have a pan ready every time too!

[@LawrenceTolman]

I had a pan under there, but most of the fluid missed it lol

[@altink8823]

awesome to see the progress

[@Kuzican01]

Great videos as always. I love all the progress you make with these trucks!

[@aaronphx420]

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.

[@LawrenceTolman]

we'll see how that confidence works out once we try and drive it lol... it might end up sounding like a rock crusher

[@aaronphx420]

@@LawrenceTolman hahaha at least you know it was built with love ♡ ♡ ♡

[@1slow5point0]

Nice work. Looking forward to seeing the big block content. I always ran big block Chevys in my jetboats.

[@ValarAmstaffs]

Looking forward to seeing the upcoming Ugly Truck content!!! Keep up the great work LT!!!

[@genegalpin556]

Great Video buddy! Miss you from trucks! And great info. Thanks.

[@hunterwatson105]

Awesome videos, love the detail you go into these videos and can't wait to see new motor for ugly truck.

[@porkbbq]

Well it is all wheel drive. And it’s one of the best projects out there in KZbin 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😎

[@LawrenceTolman]

hey thanks a ton!

[@dantwomey]

The NV149 was in some of the Silverado SS's (I had one) and they were full-time AWD.

[@craigparamore4619]

LT send some of that rain to Texas, thanks for the detailed videos.

[@dansherwood9851]

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!!!

[@Clawson_customs]

I live in Utah also love the rain here too

[@1960Murf]

You cracked 80k subscribers. You should make 100 before end of year.

[@LawrenceTolman]

I hope so!

[@tatted_dad7827]

I’m curious. How much hp will the np149 hold? I’m working on a not awd build myself

[@jman6030]

Cool..nice truck.My blazer was full time 4 wheel drive..

[@ryanroberts1104]

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. :)

[@dalehall2993]

I have that Missing bearing LT...i can send you a pic of that bearing in an email if you need it.

[@LawrenceTolman]

dang, too late. the case is already together, and besides, it actually didn't look bad at all so I didnt mind reusing it

[@johnj2496]

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

[@johnj2496]

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

[@brudevold62]

WPC and cryo treatment would be an awesome touch to the rebuild.

[@raymanjohan8838]

@ 3:16 what clamps are those to hold the cats in place ?

[@BuiltDifferent13]

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

[@timandthat.538]

Haven't commented in a while. But here I am. Been watching and waiting. I gotta say your definitely starting to develop your KZbin 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.

[@melissamalone1530]

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

[@richardkicklighter8280]

Awesome, can't wait for next video.

[@Fernando-Lopez67]

Love how you’ll never catch LT in a lie, you can see it’s all showing issues and outcomes

[@grants.9120]

I enjoy how all hydraulic presses sound the same when they are released

[@tqservices2000]

...again "GREAT and INFORMATIVE video...Do you have the info on the input shaft needed to do the 4L80e swap ?

[@michaeljucius9509]

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.

[@johnnystanley4469]

Awsome content, thanks for showing us

[@mimimorlan]

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 🤘🤘🤘🤘🤘

[@adriancastro7526]

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

[@Jimthechevywheelman]

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)

[@Christyles92]

Great video I have a mechanic doing a 4l80 swap for me .. I'm waiting the 32 spline input adapter

[@james10739]

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

[@pitt42075]

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.

[@bradley3549]

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!

[@davep6179]

Have you seen the case saver for the pumps that replace the old anti-rattle clip in the case for the pump.

[@zachpeters514]

Small suggestion, get a cheap French fryer for the shop. Makes installing bearings and gears super easy. They fall on and shrink fit.

[@antonioflores4296]

What about the vas sensor on the transfer case I just need exten wires from 4l80 vss?

[@codyadams6849]

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 ?

[@jasonnellis3566]

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.

[@shaneletson]

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

[@bmak7874]

That assemble goo is great. Highly recommend.

[@KaosProject21]

does the awd Tcase bolt directly to a 4x4 NV45? They're the same brand, but its a 2500 box again so... will that same adapter work?

[@9090ruby]

I really like this truck!

[@codydunn242]

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.

[@destinybledsoe7626]

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!

[@turboflush]

do you like that Trans jack? Build a bearing installer kit? Brand?

[@synisterfab]

Is that a lowered Toyota behind the gmc? I like it

[@jerryjackson8016]

I know this is an old video, but what’s the max horse you can put through that unit?

[@Stevesbe]

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

[@bradley3549]

Having 2wd/4hi/4lo requires a lot of extra moving parts, that's for sure!

[@ryanlabbate515]

Love these videos, just subscribed!

[@joshuahodges7890]

Where did you get all the parts for the rebuild kit

[@robertmahaney6831]

you held a clinic with that press

[@agoodballet]

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.

[@jamalgordon7824]

Lt any advice…I have a 2011 sierra 1500 5.3 6l80 4x4. Have you every performed swap on later model truck? Thanks

[@jonhalldav]

Can you please send me the parts and sources where you got these parts from? How hard is it to really get done? Thanks!

[@jasonnellis3566]

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

[@Fr8TrainPerformance]

So this is a 4X4 transfer case converted to AWD? can you do vise versa for an 08 AWD Sierra Denali? I want to convert to RWD i dont mind carrying the transfer case free spinning

[@flashgordon3715]

Your lawns are so green, you have no idea what a drought is.

[@edwardciaglia7494]

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.

[@LawrenceTolman]

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

[@HardNorthOutdoors]

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]

the 149 is a much better option. it will lock solid and they are tough

[@HardNorthOutdoors]

@@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.

[@FunnyMuffler]

Looking forward to seeing that big beast of an engine! _FMG_

[@Techangler65]

All wheel drive. Done ✅

[@danmarklesr6260]

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.

[@CraftwerksMC]

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.

[@julio3421]

I've seen people modify their parts washer with a car filter it's really neat maybe you should think about that

[@LawrenceTolman]

I thought about that, but never got around to doing it. would be a good idea though.

[@northern3274]

Would I have to change the front differential or just the transfer case

[@derekwilson9215]

Wait what the motor?!!! Did not see that coming

[@bryanmasalta2446]

I need my np149 rebuilt!

[@richiquinones8407]

Do u have modern muscle salvage number I want to order a coupler too for my 4l80 to put a 149gm

[@birddog79]

We need some of that rain in northern Indiana.

[@ObsErnesto]

It’s the Jean shorts for me 😂 made the whole video LT lookin 18 again

[@trdscfjc]

LT if you have a 4x4 transfer case like a NP205 or a NP273 and run that to a dana 70 high pinion front axle and you swap its front differential for a limited slip so that it could run all the time would that be like a awd (of sorts) ?

[@LawrenceTolman]

the key for full time AWD is inside the transfer case and those two cases you mentioned do not have a center differential. if you tried to run those on pavement, it would bind up while turning corners and likely break something in short order. to make is true AWD, you need a case like a BW4481, NV149, NP120, or others.

[@croomsracingengines9265]

Where did you get the rebuild kit and pump kit?

[@The1992rs]

Where did you get your rebuild kit?

[@Sean-zc3iv]

Did you custom make that clean station? that's dope

[@214DTownDallas]

Whats the difference between NP149 and 246 trsnsfer cases? Mine has a metal tag with the 149 on it and the one I got was from a 2005 denali with a sticker tag, and it says YK 44-81-003

[@LawrenceTolman]

NP149 is a full time all wheel drive case, the NP246 is a selectable 4wd, 2wd, and 4x4-low case that uses a clutch pack to engage on the fly as the computer senses wheel slip

[@NsanityGarage]

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?

[@LawrenceTolman]

I have bought em through ebay, but amazon actually sells the aluminum GM version

[@Nathan-uo9yf]

03 Silverado, Going from an np246 to a 149, will I need a harness from a donor vehicle or can I use my current speed sensor harness for the new tcase?

[@LawrenceTolman]

no need for a new harness, your current speed sensor will plug back in (might need to lengthen it though), disconnect the TCCM and 4x4 switch behind the dash and install the AWD front diff or find a way to permanently engage yours.

[@Nathan-uo9yf]

@@LawrenceTolman I’ve got a diff from the same vehicle as the 149 and front driveshaft. Thanks for the tip, should be able to tune out the tccm and service 4wd light and hopefully good to go. Anything else I’m missing let me know! Thanks for the reply!

[@DR-px5sh]

I think you said it somewhere but, where did you get the 32 spline input?

[@LawrenceTolman]

Tim S. at Modern Muscle Salvage in Michigan

[@MR-uk7iy]

Love the vids man

[@jeffklonowski6816]

It'd be nice to see an awd obs conversion with all your current knowledge

[@LawrenceTolman]

I did one already actually… look up project redtide from my PowerNation days.

[@jeffklonowski6816]

@@LawrenceTolman im literrally watching it right now lol. Sorry

[@jessebrown2100]

... could it be part GMC with most wheels drive (cousins and such ) .......

[@flashgordon3715]

I have one of these in a GMC Savana Van. I've broken three of them with in 140000 miles. Rear wheel drive still works fine. What am I doing wrong and what's coming apart on mine? I actually have a spare because they are impossible to find now.

[@flashgordon3715]

I'm very careful to keep the same inflation equal

[@a.c.e06z56]

Hello LT! AWD Extremely cool! 😎

[@LawrenceTolman]

Hey, thanks!

[@myrondesjarlait9752]

On the not an awd team cause you made us wait to see the new motor. 🤣😂🤣

[@LawrenceTolman]

ok, that's fair. no argument there

[@randytravis3998]

@@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 ..

[@jeffkohnzart]

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 :)