Posted by Jeff B. on December 06, 2015 at 18:21:27 from (69.20.150.146):
In Reply to: AWD versus 4WD posted by Dan in North Houston on December 06, 2015 at 15:41:36:
The newer AWD systems in chevys use a clutch pack in the transfer case to apply power to the front (or rear) axles incrementally. If the computer detects a speed difference of a certain magnitude between wheels (slippage) it will apply the clutch pack just enough to even out the flow and stop the slip. These systems are extremely sensitive to differences in tire diameter. A difference in diameter of as little as one fourth inch can fool the computer into thinking one tire is slipping, resulting in constant partial appication of the transfer case clutch pack, and premature failure of the clutch due to overheating. Tires must be replaced in pairs, and measured for size, using a stagger guage, as even 2 tires of the same make can vary a little. If you have one tire ruined for any reason, the tire store will try to sell you a pair for that reason. Better listen to them, because it's true. And that goes for front to back as well as side to side, so one ruined tire may end up costing you the price of a whole set.
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