Section 102 (Manual Transmission Servicing): Identification: Transmission
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2002 GMC Sierra, 2002 GMC Cab & Chassis Sierra, 2002 GMC C3500 HD, 2002 Chevrolet Silverado, and 2002 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
Identification tag for ZF S6-650 6-speed transmission is located on left side of case. All other transmissions are stamped with a VIN code or derivative.