* TH700-R4: A 4-speed automatic transmission. This was likely the most prevalent option.
* SM465: A 4-speed manual transmission. Less common than the automatic, but still possible.
* NV4500: A 5-speed manual transmission. Less likely than the SM465 but possible, especially on higher-spec or heavier-duty trucks.
To know for certain which transmission is in *your* specific 1992 Chevy C2500 2WD, you need to check:
* The vehicle's identification number (VIN): A decoding service or the dealer can provide transmission information using the VIN.
* The transmission itself: Look for a tag or casting number on the transmission housing. This number can be cross-referenced to identify the transmission type.
* The owner's manual (if available): This should specify the transmission.
Without additional information about your specific truck, it's impossible to say definitively which transmission it has.