* 4L60E: This is a very common 4-speed automatic transmission found in many GM vehicles of that era. It's likely the most prevalent in the 1997 Silverado 1500.
* 4L80E: A heavier-duty 4-speed automatic, more likely found in higher-payload or towing-package trucks.
To know for sure which transmission is in *your* specific 1997 Chevy 1500, you need to check one of the following:
* The vehicle's identification number (VIN): A VIN decoder (many are available online) can tell you the exact transmission installed.
* The transmission itself: Look for a tag or casting number on the transmission case. This number can be cross-referenced to identify the transmission type.
* Your owner's manual: If you still have the original owner's manual, it should specify the transmission.
Without this information, it's impossible to say with certainty which transmission your truck has.
