ig109

Ok, so ive been all over here, everyone has a different idea.. Im wanting to do an Awd conversion.. Using my 4L60E converting to 4wd output, beefing up a few things internally along the way, and then adding a transfer case to the rear.. I can do it all myself, have before, but i am confused on the different case designs.. Some say that they work through the ABS to provide traction, some seem to work by magic.. I am looking for something that i can install and dont have to select or do anything (if that exists) more than that i am wanting something that i can do without having to swap an entire TCM harness and everything to make work.

So can someone explain the different Awd Case models and how they work briefly and which one is simpler??

Also the front diff, same question..

Someone Help!!!

ig109

I see the TBSS case is a NP120 GM case.. It doesnt appear to have any selectability and just works.. Will this work?? Seems good.

budhayes3

iTrader: (19)

A transfercase, front driveshaft, and front axle assy out of an AWD SS will work, and there are others, (Denali I believe), but I'm not 100% sure what they all are. There are guys who have done the swap, hopefully one of them will chime in for you.

Just noticed that you appear to have an 07 GMT900 truck...not sure if the SS stuff will work or not, but a new AWD Denali front drivetrain should work...

ig109

Also the Escalade and SS trucks seem to use a NP149???

Midnight

iTrader: (17)

Yeah there is that one and a Borg Warner model too. I am also interested in doing this swap.

denali-08

iTrader: (1)

I used escalade transfer case and escalade front differential

ig109

If my research shows correctly the TBSS case is actually an NP126 case.. Being that it has a torsen diff in it.. I am interested to see the model on the Borg Warner piece.. Seems to me that the NP126 should be plenty, i am not making big power, i may one day swap to a 5.7 LS1 but never more than 400 HP, so the 126 should be good. And from what ive seen it contains no electronics, it just works, which i like...

Correct me if im wrong.. :nunchuk1:

ig109

The GMT900 Nalis and Lades use the Borg Warner 4485 case... Which i cannot yet find info on.. going to keep digging..

ig109

The borg-Warner case 4485 apparently has an open gearset, and used Traction control and brake modulation to control which wheel gets power.. So i would imagine that is the one to stay away from with what i want.. For others it may be the key..

Sounds like bunch of letdowns to me though

1Bear

iTrader: (1)

If you want the strongest / least obtrusive transfer-case, then the NVG-149 is what you’re after. It requires no inputs what-so-ever and the only wiring going to it is the VSS. It is totally mechanical in nature. The NVG-149 has a max capacity torque rating of 2203 lb.-ft. making it one of the stronger 1/2 ton cases available, AWD or not.

As you mentioned, the newer BorgWarner cases are an open differential type case that works in conjunction with the ABS. This wouldn’t in my mind lend itself to swaps.