Vehicle is 2001 Chevrolet Silverado 2500 hd with 6.6L duramax diesel and allison automatic transmission. At approximately 88,000 miles / approx 2500 hours, the transfer case hydraulic pump wore through the rear half of the transfer case, resulting in large amount of transmission fluid being released on the underside of the vehicle. Since the oil is flammable and it gets sprayed all over the bottom of the vehicle (including the exhaust system) it probably presents a fire hazard. It is at the very least a known defect, as minimal research online (see www.dieselplace.com/ and search in the drivetrain thread for "pump rub") will show dozens, if not hundreds of owners of this vehicle type that are having to fix this problem.

- Glen Rock, PA, USA

Universal joint broke. It was taken for repair since it was under warranty. Three weeks later the transfer case broke, and transmission went out preventing the vehicle from moving. GMC sent an appraiser to check vehicle.

- Allegan, MI, USA

Consumer purchased a brand new Chevrolet siverado. After about 1500 miles vehicle developed a popping noise in the transfer case. Consumer took the vehicle back to the dealer, and was informed that vehicle had a history of this problem ranging from the 1998 to 2004 models. However, this vehicle was out of warranty, and dealer and manufacturer were not willing to assist consumer with this defect.

- Somerset, KY, USA

Theconsumer noticed fluid leaking underneath the vehicle. The vehicle was taken to the dealer. The dealer informed the consumer that the problem was a crack in the transfer case and it was not covered under a recall.

- Sheridan, AR, USA

The vehicle's transfer case failed. Upon further inspection the dealer located a hole in the aluminum case. The hole allowed fluid to be discharged which meant the transfer case could not be rebuilt.

- Centerville, MN, USA

4 wheel drive makes a grinding/growling noise and binds the vehicle to a stop with only a slight turn of the wheel. This did not happen until 17,000 miles on the vehicle and continues to worsen as time goes by. Chev 2001 Silverado 1500 4WD.

- Glendive, MT, USA

Consumer stated that a leak in the transfer case after 36,000 miles caused driveline to lock up.this happened at 49,000 miles.

- Menominee, MI, USA

I have 2001 Chevrolet 2500 hd 4X4 crew cab short box, with a 5 speed allison automatic with push button 4 wheel drive on the dash. At 117,000 miles my transfer case went out leaving me stranded luckily only 30 miles from home. Now at 279,000 miles my transfer case goes out again this time leaving me stranded on the wv turnpike. I realize the vechile has high miles on it mostly from towing campers and mostly all highway miles. The total 4 wheel drive miles can't be over 200 miles. I have a friend in Indiana who has a 3500 with about 175,000 miles on his and he just replaced transfer case this past week. My question is are we the only two to have transfer case problems? no where can I find any bulletins or anything relating to GM on transfer case problems. Maybe you could let me know if there are any.

- Union City, PA, USA

2001 Chevrolet Silverado 2500 hd 4 wheel drive. The truck makes a loud banging noise when shifting into 4 wheel drive (on the fly). This happens almost every time when going into 4 wheel drive.

- Mountlake Terrace, WA, USA