Three problems related to transmission failure have been reported for the 2000 GMC Sierra. The most recently reported issues are listed below.
The contact stated the transmission failed while driving. The vehicle would not go into reverse. After getting the vehicle home he had it towed to a transmission shop. They found there was a crack in an internal hub. This caused a loss of oil pressure, and lubrication. They replaced all damaged parts. There have been no problems since.
Transmission failed. No reverse. Reaction shell gear teeth stripped out. Common problem with 4l60e transmissions. Only 52000 miles. Went out with no warning.
2000 2wd Sierra - sun gear shell defective from mfg (known problem) (1) total transimission failure - rebuild. (2) total transmission failure - rebuild.