The New Venture Gear Corporation was developed when GM’s Muncie Transmission Division and Chrysler’s New Process Corporation joined forces to manufacture a full product line of manual transmissions. The NV4500 transmission was the highlight of this new venture. Featuring a granny low first gear coupled with a fifth gear overdrive, the stout NV4500 is truly the best of both worlds.
First introduced in 1992, the NV4500 is a constant mesh helical geared, heavy duty 5 speed transmission. All forward gears are fully synchronized. The initial Dodge version offered a synchronized reverse. The transmission case is cast iron with an aluminum top cover. The case measures 12.375 inches and features dual PTO ports. The shifter handle typically allows for better accessibility over older granny 4 speeds as it is located further rearward at 9-1/2" from the face of the transmission.
The 1992 & 1994 GM versions have a lower first gear of 6.34 and can be identified by a smaller front bolt pattern with a top to bottom measurement of 4.685". After 1995, the first gear and front bolt pattern reverted to the Dodge 5.61 first gear and the taller top to bottom 6.043" bolt hole configuration. The synchronized reverse was also added and the front bearing retainer was enlarged from 5.125" to 5.6" diameter. As a general rule, a GM NV4500 4WD transmission will always have a 32 spline rear output shaft with an 8-1/8" rear tailhousing. The input shaft is 6-5/8" 1-1/8" 10 spline with a .590" pilot tip.
Dodge 4wd NV4500 transmissions have always maintained the same gear ratios and bolt patterns throughout production; however, variations occur between diesel (and V10) versus gas models. Diesel NV4500 4WD transmissions always have a 29 spine rear output shaft with a 6-1/4"" rear tailhousing. The input shaft is 7-1/2" 1-1/4" 10 spline with a .75" pilot tip. The front bearing retainer index is 5.6" with a snout diameter of 1.75".
Dodge Gas 4wd NV4500s initially were introduced with a 23 spline rear output shaft and a 6-1/4 tailhousing. The input shaft is 7-1/2", 1-1/8" 10 spline with a .75" pilot tip. The front retainer is 5.6" with a 1.43" snout. In 2001, Dodge discontinued the 23 spline output shaft on the gas version NV4500, and all Dodge transmissions standardized to 29 spline. For most conversion applications, we like the Dodge gas version transmission with a GM input shaft. This allows the shortest transmission length for most applications. The GM input shaft from a 6.34:1 early transmission will not fit the Dodge transmissions.
The NV4500 transmission uses approximately one gallon of synthetic oil. This oil is available at your local Dodge authorized dealer under Part No. 4874459 (quart), or your local GM authorized dealer under Part No. 12346190 (quart). Unlike regular petroleum oil that breaks down when it gets too hot, this synthetic oil is made up of different properties that do not break down. The transmissions are also equipped with synchronizer rings that are made of a fibrous material. The wrong fluid will cause the unit to develop “sticky” shifting. If the wrong fluid is used, more than likely you will have to have your transmission rebuilt.
DO NOT SUBSTITUTE any other lubricant as internal damage will occur. NOTE: Castrol Syntech is NOT the same as Castrol Syntorq.
The NV4500 transmission identification tag is attached to the shifter top cover. The tag provides the transmission model number, build date, and part number. Be sure not to remove the I.D. tag during the conversion. The information on this tag is essential for ordering the correct replacement parts. Since we use various transmission configurations for the different types of transfer case & bellhousing adapters, be sure to examine the application for your particular conversion before finalizing the purchase of a NV4500.
The NV4500 transmission is still one of the most popular and versatile transmission for converting into your 4 or 2 Wheel Drive. We offer complete transmissions, rebuild parts and a full line of engine and transfer case adapters for the NV4500.
NV4500 transfer case adapters:
Along with all the adapter lines we also carry the necessary linkage brackets when doing any of the transmission swaps.
Do you have more questions? Talk with one of our experts today - we'd love to help you out!