NHTSA (USA)Critical
1996 GMC SONOMANHTSA Campaign #96V035000
The official notice
Defect
SOME OF THESE TRUCKS WERE BUILT WITH TRANSMISSIONS CONTAINING PARTS WHICH WERE NOT MACHINED TO GM'S SPECIFICATIONS.
Safety Risk
THESE TRANSMISSIONS COULD SEIZE AND LOCK THE REAR DRIVE WHEELS WHILE THE TRUCK IS BEING DRIVEN CAUSING A LOSS OF VEHICLE CONTROL INCREASING THE POTENTIAL FOR A VEHICLE ACCIDENT.
Remedy
DEALERS WILL INSPECT THE TRANSMISSION MAIN SHAFT OUTPUT TORQUE USING A SPECIAL TOOL. IF THE OUTPUT TORQUE DOES NOT MEET SPECIFICATIONS, THE TRANSMISSION WILL BE REPLACED.
Updated June 10, 2026