Three problems related to rear suspension have been reported for the 2002 GMC Sierra. The most recently reported issues are listed below.
Rear axle unstable when cornering over moderate bumps. Loses lateral traction. Dealer failed to make a genuine effort to replicate the problem. I replaced rear shocks at my own expense, problem was reduced but not eliminated.
The rear end of vehicle skips back and forth when I hit a bump/when I'm going on a ramp turning right with the weight of the vehicle on the left side and hit a bump or wash board it is the worst.
After a long trip the rear end will vibrate and shifts when taking off from a stop. Dealer drove vehicle on long trip but could not duplicate the problem. Nlm.