If it's in 4 wheel drive will it "crab" if you turn the wheels on pavement
or is the t-case like the old Jeep Eagle? I'm assuming the front axle never
disengages if the t-case supplies power in 2 Hi. Or does it?
I admit I'm not up on this system. How close is it to what's in a Hummer?
And if you would, how does a Hummer lock the rear differential?
No, because when the t/case is in 2hi, the clutch pack is applying
approx 5% torque to the front driveshaft, but the front axle is
disengaged. So you will not feel the crowhopping. Actually, you
won't feel the crowhopping even if the front axle is engaged, because
that is exactly what happens when you select Auto4hi. Now the
front diff engaged, but the clutch pack is not engaged "enough" so
that it slips and allows different shaft speeds...front to rear. As soon
as the t/case module "see's" shaft speeds that are too far apart, it
begins to apply the clutch to bring the speeds back together. The
tcase has 3 speed sensors, two on the rear shaft, one on the front
shaft. A scan tool is very useful for diagnosis as you can see
whether the t/case is slipping or not.
When you enter 4hi, the clutch pack is completely engaged and
the t/case behaves like an old style t/case.
I'm not up on the Hummer either, so I can't comment. The full
size Hummer is a different beast all together....the fake one is
nothing more then a GM truck with square body on it. That one
probably has the exact same t/case. Rear end locking, not up
on that on a Hummer.
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