You are splitting hairs, and not all AWD GM vehicles use that
system. How about the open systems that use the stabilitrak to
achieve traction control? The point is, whether it's 50/50 or 70/30
all four wheels are being "driven" at all times. I didn't really
think that anyone would want a complete lecture on the
intricasies of every GM system (there are a ton of them, as you
ought to know)
Can you tell me what the main (mechanical) differences are between the
Bravada's AWD and the "automatic 4X4" mode on my '99 Blazer (the auto
button to the left of the 4WD HI/LO butons)? For some reason, I
thought that the Bravada used some kind of viscous coupling, and the
Blazer was entirely mechanical. I forget what it is at the moment,
but I don't Chevy and Olds use the same marketing name for their
auto-4X4 mode (AWD?).
Not Dead Yet
The Bravada AWD system uses the same basic t/case as the
Blazer, but it's only a single speed. It uses the clutch pack to
modulate torque to the front axle as needed. It's always engaged
at a certain percentage, 5-10 percent I believe, sensors on the
front and rear output shaft let the t/case module know when the
front axle needs more or less torque depending on rotational
differences. The clutch pack is applied as needed.
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