C3 Corvette Transmission Codes 1977 to 1982

Reading your transmission's build code

This page covers 1977 to 1982 Corvettes, which came with either a manual gearbox or one of Chevrolet's Turbo Hydra-Matic automatics. Automatics carry a stamped or riveted code on the transmission case, typically on the vertical surface near the oil pan rail, showing the transmission type along with build plant and date information. Manual transmissions carry similar identifying stamps on their case.

These codes let you confirm what transmission a car actually left the factory with and roughly when and where it was built, which is useful when verifying a car's originality or sorting out a replacement unit from the original. The table below breaks down the codes used across 1977 through 1982.