Transmission System Description and Operation
WARNING: This page is about a different car, the 2003 GMC Sierra, 2003 GMC Cab & Chassis Sierra, 2003 Chevrolet Silverado, and 2003 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
The NV 4500 is a 5 speed manual transmission with the fifth speed an overdrive ratio. The 5 forward gears and the reverse gear are fully synchronized. The shifting components are located in the shift cover. The shift cover is not rebuildable.
The 5th speed gear is located on the countershaft in the extension housing. There are 3 types of extension housings depending on the vehicle model.
- C 3500 HD model is cast iron
- C model is aluminum
- K model is aluminum and does not use a rear seal
The main shaft varies between models due to the extension housing configurations.