* Allison 1000 5-speed automatic: This was the standard transmission for the 3500HD. It was known for its durability and towing capacity.
* 6L90 6-speed automatic: This transmission was an optional upgrade, offering improved fuel economy and smoother performance.
To determine the specific transmission your 2007 Silverado 3500HD has, you can:
* Check the VIN: The Vehicle Identification Number (VIN) will have information about the specific vehicle features, including the transmission.
* Look at the sticker on the driver's side door jamb: This sticker often includes information about the transmission type.
* Consult the owner's manual: The manual will provide detailed information about your specific vehicle.
* Contact a Chevrolet dealer: They can access your vehicle's information and provide you with the correct transmission details.
