* 4L80E: This is the most common automatic transmission for a truck of that era and weight class. It's a heavy-duty 4-speed automatic.
* NV4500: This was a common manual transmission option. It's a 5-speed manual.
Without the specific vehicle identification number (VIN), it's impossible to say for certain which transmission was installed on a particular truck. The best way to know for sure is to:
* Check the owner's manual: If you have the original manual, it will list the transmission type.
* Look at the transmission itself: The transmission case usually has identifying numbers and letters cast into it. You can then search online for those numbers to identify the specific transmission.
* Check the build sheet (if available): A build sheet from the factory will list the options, including the transmission.
