My truck and tbss do great in the snow and ice. I love both of my awd vehicles. I dont think that there is a way to change bias. You might could swap the hummer transfer case in but it would be difficult and ground breaking as I dont think anyone else has done it.

 

What is the story on the Hummer case? is it a full time 4wd type deal? Im clueless when it comes to those turds..

 

It is all the time awd and has a real differential inside instead of a viscous coupling. It is also selectable between 4hi and 4lo. The best of both worlds.
Too much electrical stuff for me to attempt. The silverado ss case is only a matter of disconnecting stuff instead of adding lots of stuff. I wish someone would do it and write it up.

 

Arent the denali's equipped in the same manner?? If they are then the hummer most likely uses the EBCM to control Braking making it transfer power to the wheel that needs it the most.. If im not mistaken.. I think that is the same mode of operation as the Denali SUV and i assume the AWD Denali Trucks..


Correct me if im wrong.. Anyone know the transfer case model# for the Hummer.. ?

 

Also the TBSS uses a torsen differential in the case instead of a viscous coupling... That is why i thought to use it instead of the SSS case.. I am a big fan of things which are mechanical.. Not so much a fan of electronics and brake assisted Bull.. I just hear bad things about the TBSS's ability in the snow and other slick areas.. My truck is terrible on any surface but dry pavement and then it is only good because the little 4.8 just doesnt have the torque to make it slip.. Get in grass or even on wet pavement and you steer with your gas pedal.. It wouldnt even back up my grassy hill to unload a treadclimber.. WTF! Therefore i am going to convert it.. Giving me the best of everything.. all weather traction and when i get the LS1 built (reguardless of what i end up doing to it.. Strokin it or leaving it 5.7) the added power will make for fun honda stompin..

 

The Denalis are not equipped the same as the hummer.

 

The Hummer H2 uses a BW4484 2-speed, full-time AWD, open differential in conjunction with traction control, high and low range lock. The ’03 thru ’06 Yukon Denali & Cadillac Escalade use a BW4481 1-speed, full-time AWD, open differential in conjunction with traction control. The ’01 GMC C3/’02 thru ’07 Classic Sierra Denali & ’03 thru ’05 half SS Silverado all use the NVG149 1-speed, full-time AWD, viscous coupling. The newer model NNBS Sierra & Yukon Denali’s also use an open differential style transfer-case that works in conjunction with traction control and are the ones people are not too proud of in the winter. They work fine as long as you go real easy with the throttle and let the brakes modulate the power from back to front and so forth, if the tires spin aggressively, all you will get is a bunch of ABS action happening and still continue to spin the tires on one axle. Choosing the NVG149 would be the simplest straight forward route to take, it just works and you can go full throttle without worrying if one axle or the other is going to engage, they will. Supposedly, the reason GM switched to the open style differential transfer-cases is because they had to switch to the ABS system for the StabiliTrack to work. StabiliTrack has to be able to control the traction to be effective and with the viscous system it wouldn't work well.

 

Very well said... Thank you.. I plan to use the NVG149 in the truck.. the NVG126 that the TBSS uses is still a viable option i think.. It should work in the same manner as the 149 if im not mistaken.. I have an NVG149, but im not sure if its good.. And hate to install it without knowing.. But right now im playing the money juggling act so it may take a bit to know one way or the other..

Thanks for all the info and help thusfar.. I cant wait to actually do the swap and post up a writeup..

 

You can test the 149. The procedure is on denalitrucks.com they have a documents section that has it. I use to have it book marked. I don't have time to search it out right now.

 

That's right, we do have a lot of good info over there. Access the documents section at the top of the page and not through the forums.