Transmission identification – Advance Adapters AX15 User Manual

Page 5

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1993-95 GM NV4500

Bellhousing Bolt Pattern

TRANSMISSION IDENTIFICATION

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.

GM 4WD NV4500 (1993-94)

During the first two years of the NV4500, Chevy offered this 5 speed with a 6.34:1
1st gear; 2nd 3.44:1; 3rd 1.71:1; 4th 1:1 ratio, and a 27% overdrive. It was also the
first year that Chevy changed the bellhousing-to-transmission bolt pattern. This
transmission is ideal when converting your vehicle, providing an ultra-low 1st gear.
GM, however, only produced this particular ratio during these years. The major
complaint of this 5 speed was stiff shifting and noise in 3rd gear.

Identification of this transmission can be obtained by using the identification charts
in this manual. Due to the interchangeability of other NV4500 components, we also
recommend that you verify the following information. Starting at the front, this GM
transmission should have a input shaft pilot tip diameter of .590”. The spline of
the input is 1-1/8” diameter 10 spline and protrudes approximately 6-5/8” from the
face of the transmission. This input shaft cannot be interchanged with any other
NV4500 input shafts other than transmissions with the same 1st gear ratio unless
you change the counter drive gear also. The front bearing retainer index is 5.125”,
with a snout diameter of 1.373”, and a front bolt pattern as shown. The shifter stud
on the top cover is a male threaded connection. The rear of this transmission has an aluminum adapter housing which measures
8-1/8” long; and the output shaft is 32 spline. Most transfer case adapters for this transmission will require the replacement of
the tailhousing and the shortening of the output shaft.

This transmission cannot be used with a Ford engine.

GM 4WD NV4500 (1995)

This transmission is identical to the 1993-94 transmission, except the 1st gear ratio had been changed to 5.61:1; 2nd 3.04:1; 3rd
1.67:1; 4th 1:1 ratio, and a 27% overdrive. The noise and shifting problems had been corrected.

Identification of this transmission can be obtained by using the identification charts in this
manual. Due to the interchangeability of other NV4500 components, we also recommend
that you verify the following information: Starting at the front, this GM transmission should
have a input shaft pilot tip diameter of .590”. The spline of the input is 1-1/8” diameter 10
spline and protrudes approximately 6-5/8” from the face of the transmission. This input shaft
can be interchanged with other NV4500 input shafts with this 5.61 1st gear ratio. The front
bearing retainer index is 5.125”, with a snout diameter of 1.373”, and a front bolt pattern as
above. The shifter stud on the top cover is a male threaded connection. The rear of this
transmission has an aluminum adapter housing which measures 8-1/8” long; and the
output shaft is 32 spline. Most transfer case adapters for this transmission will require the
replacement of the tailhousing and the shortening of the output shaft.

GM 4WD NV4500 (1996 & Newer)

This transmission has the same gear ratio as the 1995 version (1st 5.61:1; 2nd 3.04:1; 3rd 1.67:1; 4th 1:1 ratio, and a 27% overdrive).
Chevy once again changed the bellhousing-to-transmission bolt pattern and went to a larger bellhousing index diameter. The new
bolt pattern and index are the same as the Dodge Standard Duty NV4500. These transmissions
use a GM internal release bearing.

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This manual is related to the following products:

NV3550, NV4500

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