See Figures 1, 2, 3 and 4
The two speed Powerglide transmission was used in the Corvette from 1963-67. From 1967-77, either the Turbo Hydra-Matic 350 (TH350) or the TH400 is used. In the years of 1978-81, the TH350 was the only available automatic transmission. In 1980 (except California models), an electrically controlled locking torque convertor was introduced to improve fuel economy. All 1981-82 models have this feature. In 1982, the TH700R-4, four speed automatic transmission was the only transmission available in the Corvette. Identification of most transmissions can be made by the shape of the oil pan.