* TH700R4: This was a very common 3-speed automatic overdrive transmission. This is probably the *most likely* candidate.
* SM465: This was a 4-speed manual transmission.
* TH350: A 3-speed automatic, less common than the TH700R4 in that year, but possible.
To know for *certain* which transmission was in *your* specific truck, you'd need to:
* Check the VIN: Decoding the VIN can sometimes reveal transmission information.
* Look at the transmission itself: The transmission case will have identifying numbers stamped on it.
* Check the build sheet (if available): If you have the original build sheet for the truck, it will definitively state the transmission type.
The most practical approach is to check the transmission case itself for identification numbers.
