* 3-speed manual: A common and basic option.
* 4-speed manual: Also a fairly common option, offering more versatility.
* TH350 3-speed automatic: A very popular automatic transmission in GM trucks of that era.
* TH400 3-speed heavy-duty automatic: Used in heavier-duty trucks or those with larger engines.
To know for certain what transmission is in *a specific* 1983 Chevy truck, you'd need to check:
* The vehicle's identification number (VIN): Decoding the VIN can sometimes reveal transmission information.
* The truck's build sheet (if available): This will definitively list the options, including the transmission.
* The transmission itself: Look for markings on the transmission case.
Without knowing the specific truck, it's impossible to say definitively which transmission it has.