Hi to you all guys!
Can someone please confirm what kind of differentials (front & rear) is used to MY07 H3?
Are they consider to be ''open'' or ''lsd'' differential type?
I know that the rear diff (in adv. package) is an Eaton e-locker, but when it is not locked is it working as an ''open or lsd'' type....
Searching on the net I come to answers that say ''yes'' they are both lsd type. In case you can confirm this, does anybody know what is the lsd percentage (i.e 10%-20%)?

Thank you!!!

 

LSD. I got no idea % wise, we/I've never used % in the USA. 1.5-2.5 turns of a wheel before they transfer power to the other.

 

I assume by LSD you mean like the G80 RPO diffs used in fullsize trucks and cars. I do not believe they are. They are open, however the H3 has the TCS which yields similar results to a limited slip by transferring power to the other side.

 

Limited slip differentials (LSD) use various mechanisms to allow normal differential action when going around turns. When a wheel slips, they allow more torque to be transferred to the non-slipping wheel.
Some of the different types of limited slip differentials are the clutch-type LSD, the viscous coupling, locking differential and Torsen differential.

I know i.e that the H1 uses Torsen diff. as well as the Mazda miata and Honda S2000.When a Torsen has a 3:1 TBR, that means that one side of the differential can handle up to 75% while the other side would have to only handle 25% of applied torque.
Which of the above is used in our H3s ...or none?? One thing for sure is that H3s don't use Torsen.

On the other hand the open differential always applies the same torque to both wheels, and the maximum amount of torque is limited to the greatest amount that will not make the wheels slip. Is this our case except that wheel slip is limited electronically through TCS??
This means that when in 4L mode (TCS off), both the front and the rear wheels (independently of course due to central locking) should have a slipping issue...? This is of course not an issue for the adv. package that uses a locker in the rear .(+ front in MY09)

Thank you and I appologize for all these questions!!

 

Yes, if you turned the TCS off, the truck becomes as an older style 4x4 with open diffs. That is why the front and rear lockers are nice but also they are not REALLY needed for general use. I have done plenty of wheeling with open diffs.

I can't answer your question relative to the brand names of the lockers in GM. The axles in mine are American with lockers and I had to do some research to find which model and how they compare with Dana.

 

Well I just wondering that in 4L mode, having by default/factory setting the electronics disengaged (TCS+Stabilitrak) except ABS (correct me if I am wrong), both front and rear diff will work as ''open diff''.
My point is that in 4H & 4H locked mode the truck has anti-slipping electronic advantages that automatically lost when we go to 4L mode....is that correct?
Therefore when driving in very slippery surfaces like snow/ice/black ice, the 4L mode would be rather useless as an option, unless you enganged the optional rear locker, right?

 

Traction Control is not lost in 4L....at least I can verify that on a 2008. I know there was an enourmous thread on another forum that went into detail about Stabilitrac, TCS, 4WD modes, and model years.

 

Ok, after a looong research in topics to other forums as well, I came up with the following answer from a guy who summarizes what is going on with Stabilitrak and TCS which are indeed two seperate systems, and most important is confirmed by many wheelers.

''The whole Traction Control/Stability Control (Stabilitrak) thing has confused me for a long time but I think I have it figured out now. Stabilitrak senses yaw, wheel slip and steering and will reduce throttle, apply brakes and steering control to keep the vehicle in what it considers to be a straight line. It works like TCS by applying the brakes but that's where the similiarity ends. Traction Control works in conjuction with the four wheel drive to keep wheel slip to a minimum. It has no effect on steering at all. The magic button on the dash is to turn StabSys off only. My 2007 will turn it off automatically in 4Lo. The last thing you want in a slippery mud hole is StabSys hitting the brakes and cutting engine power. But if you're in 4Hi and don't hold the button in for 5 seconds before you hit the slime, Stabilitrak will fight you for control of the vehicle. Once again, that's why the computer turns off Stabilititrak in 4Lo. Hope that clears things up a little...maybe ''

The point is that the diffs of the H3 will never react as ''open differentials'' since the TCS is always on.
The existance of TCS in all 4WD modes was actually the answer of G.M for not using i.e a Torsen type diff.