* 4L60E: This 4-speed automatic was very common.
* 4L65E: A heavier-duty version of the 4L60E, also a 4-speed automatic.
* Manual Transmissions: While less common, some 2001 Silverado 1500s were available with 5-speed and 6-speed manual transmissions, depending on the engine and trim level.
To know for certain which transmission is in *your* specific 2001 Silverado 1500, you need to check:
* The vehicle's sticker: This might be located on the driver's side doorjamb or in the glove compartment.
* The owner's manual: This will list the specifications for your specific vehicle.
* The VIN: A mechanic or dealership can use your Vehicle Identification Number (VIN) to look up the exact specifications of your truck.
* Look under the hood: You might be able to identify the transmission type from markings on the transmission case itself, although this requires some familiarity with transmission identification.
Without knowing the specific trim level and engine of your Silverado, it's impossible to give a definitive answer.
