The New Venture Gear NV4500
(109 mm) is a 5 speed manual transmission used on light duty trucks. This
manual transmission is identified by the RPO MW3. The 109 mm is the distance
between the input shaft and the counter shaft. The transmission is available
in rear wheel and four wheel drive versions. The NV4500 transmission is
built in Muncie, Indiana by New Venture Gear, (a division of New Process
Gear) for General Motors Powertrain.
The transmission has the following features:
| • | Made from cast iron for durability |
| • | Synchronized shifting in all forward gears |
| • | Constant mesh helical gearing for reduced noise |
| • | Overspeed inhibitor from low to first speed gears |
| • | Dual cone low speed gear and 1st speed gear synchronizer |
| • | Multiple ring sychronizers for smooth shifting |
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 |
| • | K model is aluminum and does not use a rear seal |
The main shaft varies between models due to the extension housing configurations.
