* 4L60E: A four-speed automatic transmission. This was very common.
* 4L80E: A four-speed automatic transmission, typically found in heavier-duty Silverado models or those with larger engines.
* NV3500: A five-speed manual transmission.
* NV4500: A five-speed manual transmission, usually in heavier-duty trucks.
To know for certain what transmission *your* specific 1997 Chevy Silverado has, you need to check:
* The owner's manual: This will list the specifications for your particular truck.
* The vehicle identification number (VIN): A dealer or parts store can use the VIN to determine the exact transmission.
* The transmission itself: Look for a tag on the transmission case which may have the model number.
Without more information about the specific truck, it's impossible to say definitively which transmission it has.
