Four problems related to differential unit have been reported for the 2000 GMC Sierra. The most recently reported issues are listed below.
Truck drive train makes clunk noise when I first start off from a stop, also in reverse. When I stop at a red light it feels like someone just hit me from behind. It started at about 39000 miles and has been getting progressively worse and now it has worn out the bushing in the tail shaft of the transmission ,wow $32000 dollars for this truck and nothing but problems . I am truly scared of this truck please help.
There is and has been an engine knock since 7/2000, has been in shop 6 times for same problem, GMC contends carbon knock, getting worse. Idles rough, told by dealer and GMC it is a characteristic of vehicle. GMC says they will continue to hornor warranty. What happens when warranty exprires, and the piston comes through the block. Drivetrain hestiates when in gear.
Consumer states he has been to the dealerhsip on several occasions to complain about the transmission slipping, it was finally determined that the differential was put in wrong, and also the driveshaft was replaced to alleviate the vibration.
When hitting a bump there was a very loud noise coming from the rear end. Truck was taken to a dealership. Dealership's opinion was that the noise was coming from a dfective ring and pinion in the rear axle. Owner was told that GMC was aware of the problem. GMC did not know what was causing this problem, and was working on a solution. Problem has not been corrected. The front seat belt squeak and has excessive tension. Rear seat latch malfunctions. Under hood light malfunctions.