- 1998 CHEVROLET TRANSMISSION FULL SIZE
- 1998 CHEVROLET TRANSMISSION MANUAL
- 1998 CHEVROLET TRANSMISSION CODE
The 3L80HD would be the THM475 (heavy duty unit).ĤL80 - An overdrive model of the THM400. 60 is the strength rating (less than the 4L80).ģL80 - The 3L80 is a renamed THM400, used in the early 1990's. 4L60 means 4 forward speeds, L = longitudily mounted (rear wheel drive). THM700-R4 - 4 Speed transmission used in GM cars and light trucks with the 2.8, 3.1, 4.3, V6, Chevrolet built 305, 350 and 454 engines from 1982 to 1992.ĤL60 - Early 1990's saw the 700R4 renamed to the 4L60, and "electronic" models were named 4L60E.
1998 CHEVROLET TRANSMISSION FULL SIZE
Generally found in Chevy & GM trucks, cadilacs and large displacement engined, full size GM rear wheel drive cars. Used on large displacement, high torque engines and engines with towing packages. THM400 - The THM400 was GM's Heavy-duty 3 speed transmission used from 1964 to 1990.
The Turbo 375 was modified to accept the Turbo 350 driveshaft yoke. It's a light duty version of the THM400, has ABSOLUTELY NO RELATION to the THM375B, and was found in 1972 to 1976 full-size cars. It'll be marked 375-THM on the bottom of the tailshaft housing. THM375 - This transmission is a derivative of the THM400 sharing the external appearance of the 400. THM375B - This trans is identical to the THM350, but is considered a heavier duty transmission. Generally able to handle up to 400 foot pounds of torque. 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.
1998 CHEVROLET TRANSMISSION MANUAL
Go here for Chevy Manual Transmission Identification. Transmissions have RPO numbers, usually beginning with "M". Chassis Vin Number stamping - beginning in 1962
1998 CHEVROLET TRANSMISSION CODE
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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