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Thrust Angle:
In the Hummer, two things affect thrust angle.
- Wheel alignment (i.e. toe, particularly the rear)
- Differential operation/wear
Toe Adjustment: If both rear wheels are pointed somewhat to the right, for instance, it will tend to push the rear of the vehicle to the right under throttle, and to the left under compression. Measuring the toe with a tape measure can show correct toe-out even if both wheels are pointing to one side. This same effect can be caused by loose suspension components - i.e. allowing one wheel to move foward or aft (slightly) in relation to the truck
chassis. (In this case, this is the more likely cause.)
Differential Operation: If the differential is showing preference for one side over the other, one of the wheels will get more force when accelerating or coasting. This causes this wheel to push/pull more than the others, causing the same symptom. Possible causes include: uneven wear inside the diff, different (effective) tire size.
Dave Breggin
'95 Diesel Wagon
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