* TH350 (Turbo Hydra-Matic 350): This was a very popular three-speed automatic. It's likely the most common transmission you'd find in that truck.
* TH400 (Turbo Hydra-Matic 400): A heavier-duty three-speed automatic, often found in trucks with heavier payloads or towing packages.
* SM465 (New Process 465): A four-speed manual transmission. This was a robust option for those who preferred a manual.
* 700R4 (Turbo Hydra-Matic 700R4): A four-speed overdrive automatic. While less common in a 1984 model than the TH350, it's possible, especially if the truck had been modified.
To know for *certain* what transmission is in *your* specific 1984 C10, you need to:
* Check the VIN: The Vehicle Identification Number (VIN) will contain information about the original specifications of the truck.
* Look under the truck: Inspect the transmission itself for identification markings.
* Check the build sheet (if available): If you have the original paperwork for the truck, this will specify the transmission.
Without looking at the specific truck, it's impossible to say definitively which transmission it has.
