* SM465 4-speed manual: A heavy-duty manual transmission.
* 700R4 4-speed automatic: A relatively common automatic for the time.
* TH350 3-speed automatic: Also a possibility, though less common than the 700R4 by 1984.
To know for sure which transmission is in *your* specific 1984 S-10 Blazer, you'll need to check:
* The vehicle's identification number (VIN): A decoder can help determine the original equipment.
* The build sheet (if available): This will specify the transmission.
* Look under the vehicle: The transmission case itself will have identifying numbers.
Looking under the vehicle is the most direct way, but a VIN decoder is a good starting point.
