My 04 Grand is getting a driveline vibration. feels like a bad u joint but I've had both driveshafts replaced. It happens on accel and decel more noticable at highway speeds. Have inspected both diffs and they r in good condition. Any advice will b greatly accepted
Thanks.

 

Could be that one of your u-joints isn't centered properly. Check your motor mounts and trans mount the rubber inside can break down fairly quickly sometimes.

 

tire problem....maybe

 

Did you check the u/j's in the front knuckles.