Generally used in straight and V6 and small block engines. THM350 - Medium duty 3 speed trans used from 1969 to 1989, Used in Buick, Olds, Pontiac and Chevrolet cars and Chevy & GMC light trucks until 1987. THM200-R4 - Used in GM rear wheel drive cars with the 3.8 V6, 305 & 350 Olds and 301 pontiac from 1981 to 1989. The 4 cylinder models have 4 large cooling holes near the torque converter, while on the "bigger cars" there are no cooling holes. THM250 - Used in small 4 cylinder cars (Vega, Sunbird, Monza) from 1973 to 1981 and some Nova/Camaro/Chevelle 6 cylinders in 1974 & 75. THM200 - Light duty, "metric" 3 speed transmission. and METRIC stamped into the pan.Ĭhevy Automatic Transmission Description & Usage The THM200 and the THM250 have pans shaped like a THM350, HOWEVER, the THM200 will have the words HYDRAMATIC DIV. Ĭhevrolet Automatic Transmission Identification & DescriptionĪutomatic transmission types are generally identified by their pan shape. Go here for Chevy Manual Transmission Identification. Transmissions have RPO numbers, usually beginning with "M". Chassis Vin Number stamping - beginning in 1962 Assembly Date Code Stamping - can be stamped anywhere. Casting numbers on the case, extention housing and side cover Transmissions are marked and identified by: General Chevrolet Transmission Identification
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