Identificando algunas cajas cambio Chevy

[GerardoLW]

Puede servir de algo o a alguien



THM200 & THM250 have pans shaped like the THM350. The difference is the THM200 will have the words HYDRAMATIC DIV. and METRIC molded on the pan.




Chevy Bell housing Bolt Patterns

On the Left up there is the 60 Degree Type, used on 4 Cylinders and the 2.8 V6 and it's replicas like 3.1 and 3.4. On the right is the more common 90 Degree Type. This was used on the 4.3 V6 and the Small and Big Block V8s.

This should answer the question for you guys that want to know if your 2.8 V6 trans will work with the V8 swap you are planning... NOPE. Sorry, unless you have a 4.3 V6 in your S-Series Truck you'll have to swap the tranny too. And just in case you still don't know, you can't use a tranny from a 4.3 V6 S10 in your 2.8 V6 S10 either.




Common S10 Manual Transmission for 4 Cylinder or 2.8, notice the Bellhousing shape and bolt pattern. This is called 60 Degree again, and will not fit a 4.3 or V8.



Automatic Transmission Details

THM200 - Light duty, metric 3 speed transmission.

THM250 - Used in small 4 cylinder cars [Vega, Sunbird, Monza] from 1973 to 1981 and some Camaro, Chevelle, Nova 6 cylinders in 1974 & 1975. The 4 cylinder models have 4 large cooling holes near the torque converter, while on the larger engines contain no cooling holes.

THM200-R4 - Used in GM rear wheel drive cars with the 3.8 V6, 305 & 350 Olds and 301 Pontiac from 1981 to 1989. This is a 4 speed, overdrive unit.

THM350 - Medium duty 3 speed transmission used from 1969 to 1989, Used in Buick, Chevrolet, Oldsmobile, and Pontiac cars and Chevy & GMC light trucks until 1987. Generally used in straight and V6 and small block engines. Generally able to handle up to 400 foot pounds of torque.

THM375B - This transmission is identical to the THM350, but is considered a heavier duty transmission.

THM375 - This transmission is a derivative of the THM400 sharing the external appearance of the 400. It is marked 375-THM on the bottom of the tail shaft housing. 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. The Turbo 375 was modified to accept the Turbo 350 drive shaft yoke.

THM400 - The THM400 was GM's Heavy-duty 3 speed transmission used from 1964 to 1990. Used on large displacement, high torque engines and engines with towing packages. Generally found in Chevy & GM trucks, Cadillacs and large displacement engines on full size GM rear wheel drive cars.

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.

4L60 - Early 1990's saw the 700R4 renamed to the 4L60, and electronic models were named 4L60E. 4L60 means 4 forward speeds, L = longitudinally mounted (rear wheel drive). 60 is the strength rating (less than the 4L80).

3L80 - The 3L80 is a renamed THM400, used in the early 1990's. The 3L80HD would be the THM475 (heavy duty unit).

4L80 - An overdrive model of the THM400. The 4L80E would be the electronic model.

Transmissions with a suffix of "C" on the end of the type (THM200C) indicate the transmission has a lock up torque converter.




Location of source serial number

THM700-R4 - the VIN is either stamped onto a boss behind the bell housing flange on the passenger side, just above the pan on the drivers side, or just behind the governor cover, stamped vertically where the case meets the tail shaft housing.

THM350 - the VIN will be stamped on either the drivers side housing near the shifter, on the right side of the housing just above the pan, or on a boss behind the bell housing flange on the passenger side of the transmission.

THM400 - the VIN is stamped on a machined surface just above the pan on the drivers side.

THM200-R4 - the VIN is stamped onto the housing towards the rear of the pan, on the drivers side.


Saludos.