The NV4500 or New Venture Gear 4500 is a heavy-duty, manual shift, five-speed with overdrive, constand mesh, longitudinally positioned transmission. All gear ranges including reverse are synchronized.

It is a top loader with a cast iron case and an aluminum shift cover. Two versions of New Venture Gear Manufactured NV4500 are used in 1994 and later up to 2002 models of the Dodge 3/4 and one ton vehicles.

A standard duty version is used for 5.2L and 5.9L applications. The main differences between the two versions concern the larger input and output shafts used in the heavy duty version.
The shift lever is located in the shift cover bolted to the top of the shift cover and operates the shift forks and rails directly. The shift forks and rails are all located within the aluminum cover which is bolted to the top of the gear case. Dual cone synchronizers are used for first and second gears.

The 1-2 synchronizer have a set of spring loaded flyweights in the synchro hub that govern shift speeds, to prevent over-revving on a 2-1 downshift. The NV4500 transmission includes reverse gear inhibitor mechanism that prevents engagement when shifting into forward gear ranges.

Additional features of the NV4500 included tapered roller bearings to support the drive gear, mainshaft, and countershaft in the gear case. Pilot roller bearings in the drive gear hub support the forward end of the mainshaft. The mainshaft gears are supported on caged type roller bearings. Drive gear thrust reaction is controlled by a needle type thrust bearing located at the forward end of the mainshaft.

The NV4500 a great replacement for the earlier Getrag 360 used by Dodge.
General Information About the New Venture 4500 Transmissions
NV4500 NV3500 NV5600
Parts New Venture Transmission Identification Guide
Diagrams Label Code Summary For Dodge And GM
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