* Allison 1000 6-speed automatic: This was the standard transmission for the 3500HD.
* 6L90 6-speed automatic: This transmission was offered as an option on some models, particularly those with the 6.0L V8 engine.
It's important to note that the specific transmission type will depend on the specific trim level and engine option of the 2014 Silverado 3500HD you're interested in.
To find out which transmission your specific vehicle has, you can:
* Check the vehicle identification number (VIN) sticker: This sticker is located on the driver's side doorjamb. It will list the transmission type.
* Consult the owner's manual: The owner's manual should provide information about your vehicle's transmission.
* Contact your local Chevrolet dealership: They can assist you in determining the transmission type based on your VIN.
