6_2LTZ

Have this issue too. Have yet to take it in.

Finally. I've been waiting for this. Never had it disabled since I may have opened the rear window once. I'll take a defrosting window over a sliding window any day.

My guess is shocks if nothing else changed. I run 40 to 45 psi in tires that are max 80psi. Two reasons for it coinciding with change in tires: The winter tires were a lower pressure and affected the way the truck hit the bumps. Or the road thawed out and the bumps changed. I changed out my ranchos for bilsteins and never worried about the rear end jumping around again.