Advance Adapters AX15 - Manual (Page 3)

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NV4500 TRANSMISSION SPECIFICATIONS
INTRODUCTION:
In 1993, General Motors and Chrysler teamed up together to manufacture a transmission referred to as the NV4500 transmission.
The NV4500 were used in both the GM & Dodge truck applications. We first learned of this transmission in mid-1993. Since then,
we have developed numerous transmission-to-transfer case adapters along with the necessary bellhousing adapters to use the
NV4500 in almost every type of 4WD vehicle; and you can see by the size of this booklet that we consider this transmission to be
a very popular conversion. This instruction manual has been provided to assist you in the products that are available for both
engine and transfer case conversions. The information contained in this manual has been based on our first hand experience.
The NV4500 is a constant mesh, helical geared 5 speed manual transmission. All forward gears are fully synchronized. The
Dodge version NV4500 offers a synchronized reverse gear. The later models of the GM NV4500 now offer the synchro-reverse
gear. This reverse gear can be added to the earlier GM NV4500 transmissions as an option. The 5th gear has an overdrive gear
ratio of .73:1. The extremely low first gear ratio along with the overdrive 5 speed combination makes this transmission very
desirable, since it offers the best possible gear ratio available for on or offroad conditions.
The transmission case is made of a cast iron material and the gear case cover is an aluminum alloy. The low profile of the top
cover provides excellent clearance for 4WD aftermarket conversions. Unlike the older GM and Ford 4 speeds, the shift tower
location has been relocated further back, approximately 9-1/2" from the face of the transmission, providing easier accessibility.
GM ONLY GM & DODGE
GEAR RATIOS: 1993-1994 1995-2004 DIMENSIONS:
First Gear ............................ 6.34 5.61 Approximate Dry Weight ................. 195 lbs.
Second Gear ....................... 3.44 3.04 Oil Capacity .................................... 8 pints
Third Gear ........................... 1.71 1.67 Maximum G.V.W.R. .......................... 14,500 lbs.
Fourth Gear ......................... 1.1 1.1 Main Case Material ........................ Cast Iron
Fifth Gear ............................. 0.73 0.73 Main Case Length .......................... 12.375"
Reverse ............................... 6.34 5.04 Extension Housing ......................... Aluminum
Top Cover Material .......................... Aluminum
There has been considerable discussion as to the best possible gear ratios to use for the various engine and transmission
combinations. Originally, GM transmissions had a 6.34:1 first gear ratio that made it the most desirable for offroad performance.
These transmissions were in high demand because of this super low first gear ratio. In 1995, GM discontinued the production of
the 6.34:1 ratio and now only offers a 5.61:1 gear ratio. All NV4500 GM & Dodge except the GM1995 and earlier have the first gear
ratio of 5.61:1. Some of the older transmissions are still available; and by using the identification charts in this booklet, you will be
able to identify the gear ratios of almost every NV4500 transmission.
TRANSMISSION LUBRICATION:
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.
We sell Ams Oil MTG under P/N 715690. This is the only suitable oil substitute.
TORQUE SPECIFICATIONS:
Part Description Foot/Inch Pounds of Torque
Top Shift Cover Bolt ............................... 200 Inch pounds
Adapter Housing .................................... 40 Foot pounds
Front Drive Gear Retainer ...................... 265 Inch pounds
Main Shaft Nut 4WD ............................... 275 Foot pounds
P.T.O. Cover Bolts .................................. 30 Foot pounds
Reverse Inhibitor Bracket ...................... 95 Inch pounds
Counter Shaft Brg. Ret. Plate ................ 200 Inch pounds
Main Shaft Brg. Ret. Plate ...................... 200 Inch pounds