Transmission System Description and Operation

The NV 4500 is a 5 speed manual transmission with the fifth speed an overdrive ratio. 5 forward gears and the reverse gear are fully synchronized. shifting components are located in the shift cover. 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.