* 4L60E: A 4-speed automatic transmission. This was very common.
* 4L80E: A 4-speed automatic transmission, typically found in heavier-duty models or those with larger engines.
* NV3500: A 5-speed manual transmission. Less common than the automatics.
To know for sure which transmission *your* specific 1996 GMC Sierra has, you need to check:
* The vehicle's identification number (VIN): A VIN decoder (many are available online) can tell you the transmission code.
* The owner's manual: This will list the transmission type for your specific truck.
* The sticker on the driver's side doorjamb: This sticker often contains information about the vehicle's specifications, including the transmission.
* Visually inspecting the transmission: This requires some knowledge of transmissions, but you can potentially identify it by looking under the truck. This is the least reliable method.
Without more specific information about your truck, it's impossible to say definitively which transmission it has.
