In 1992 General Motors trucks started appearing in showrooms with one of the most versatile transmissions ever to be offered in a production truck, the New Venture Gear 4500. General Motors applications include it as an option in 3/4 and 1-ton full size trucks. The NV4500 was first released in Chevy / GM trucks from 1993.

The bellhousing pattern for 1993-1994 GM versions is unique from the later (1995-) GM. The 1993 and 1994 Chevy versions have a lower first gear of 6.34:1 and an unsynchronized reverse gear. Transmissions after this period have a higher 5.61 low ratio and reverse gear synchronization. Input shafts for the GM units have 10 splines with 1-1/8" diameter. GM shafts stick out their usual 6-5/8".

The NV4500 transmission is a fully synchronized (except reverse on GM models) five-speed gearbox with all of the strength and low-gear benefits of older four-speeds, with a 27-percent overdrive. This unit shifts with a smooth, short action and very distinct shift gates.

Robust and reliable the NV4500 is a popular replacement in older trucks with 4 speeds.

Rated GVW - 14,500 lbs.
Dry weight - 195 lbs.
Oil capacity - 1 gallon
Case material -cast iron
Synchronizers - Carbon fiber composite
Main Counter shaft bearings - Timken tapered roller
Gear Ratios

Early GM units (93-94) were built with a lower first gear ratio of 6.34 to 1.0.

GM 93-94 95/up GM
First Gear 6.34 5.61
Second Gear 3.44 3.04
Third Gear 1.71 1.67
Fourth Gear 1.00 1.00
Fifth Gear 0.73 0.73
Reverse 6.34 5.61
Dimensions
GM (6.34) GM (5.61)
Main case 12.375" 12.375"
4WD Adapter Housing 8.125 8.125
2WD Tailhousing 6" Tailhousing 6" Tailhousing
Yoke Fixed Yoke Fixed Yoke
Input shaft stickout 6.625 6.625
Input shaft spline 1.125" 10spl 1.125" 10spl
Pilot Dia .590" .590"
Bearing Retainer specification
Bellhousing T/O bearing
Index Diamenter Snout Diamenter
GM NV4500 1993-95 5.125" 1.373"
GM NV4500 1996 and up 5.60" none: Int Slave Cyl
Bellhousing Bolt Pattern
GM 1993-1995 10.078 across the top, 10.394 across the bottom, 4.685 vertically
GM 1996 + up 10.078 across the top, 9.738 across the bottom, 6.043 vertically
Shifter Stub Specification
The NV4500 shifter will have a short stub sticking up from the top cover
There are 3 different methods by which a shifter extension handle attaches.
GM NV4500 (All) Threaded stub, 12mm x 2.0 pitch threads
Lubrication
You MUST use the correct synthetic lubricant. The GM part no. for the correct oil is 12346190 (quart). Use of ANY other oil in the NV4500 will lead to failure and also voids any chance of a warranty claim.
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
Broncos Dodge GM Jeeps Toyota Land Cruisers
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