Advance Adapters AX15 - Manual (Page 14)

new shaft installed by a qualified transmission mechanic. Your local GM and Dodge
service departments are equipped with all of the necessary tools and have been
trained for repairing these NV4500 transmissions. The average time to disassemble
and replace the new shaft would be approximately 2 hours, provided all the tools were
available.
P/N J38805 Spec. Socket for Removal of the GM 4WD Damper
NOTE: The nut that retains the harmonic balancer (damper) is extremely hard to
remove even with the right tools. One of our customers simplified the removal of the
nut by drilling the nut on opposite sides with a 1/4” drill. Once drilled, take a chisel and
split the nut into two halves. Then the special socket will not be needed.
MAIN SHAFT MODIFICATIONS:
Several of the adapters require you to shorten the existing transmission main
shaft while it is still installed in the transmission case. This is quite common when a GM 4WD transmission output shaft is being
used. Each instruction sheet gives the exact cutoff location in order to be compatible
with our components. The normal procedure for performing this operation can either
be a high speed cutoff disc or a metal abrasive cutoff saw. To assist in making the
exact cutting location, we suggest that you use tape and wrap it around the shaft to
indicate the exact cutoff location. The tape will provide a definite location since the
shaft is slowly rotated during the cutoff procedure. Once the outer surface has been
penetrated, the inner core of the shaft could be cut with a regular hacksaw. All of the
sharp edges should be smoothed to provide a good fit into our components.
CAUTION: During the cut off procedure, you must make sure to wear protective eye
gear to prevent sparks from causing damage to your eyes. The bearings and gears
should also be protected to avoid contamination of metal debris.
MAIN SHAFT END PLAY:
If the transmission you acquire requires the replacement of the transmission main shaft
or changing of the front input gear, you will need to recheck and inspect the end play tolerance on the main shaft. When installed
into the main case of the transmission, the main shaft tolerance should be .002" to .006". This is very critical and you must use
a dial indicator in order to determine if new shims will be required. Refer to the transmission service manual GM #17003.13 for
additional information.
GM & DODGE INPUT SHAFTS:
On the front of the transmission, the input shaft can vary depending on which type
of transmission is being used. We have seen three different specifications of input shafts. The input
shaft gear tooth counts are all identical on all 3 transmissions, except for the GM transmissions with
the 6.34:1 gear ratio.
Dodge also offered a early 19 spline input shaft 1992-93 transmissions, which
is no longer available. This 19 spline shaft is interchangeable with all Dodge units and it will require
a new retainer as well.
Transmission Input Shaft
All GM transmissions 1-1/8"-10 spline/.590" pilot tip
(excludes 4x2 H.D. 2001 & newer) (GM P/N12382877 or AA P/N 52-0221 )
Dodge Standard Duty transmissions 1-1/8"-10 spline/.750" pilot tip
(Dodge P/N 4882357 or AA
P/N 52-0219 )
Dodge Heavy-Duty transmissions 1-1/4"-10 spline/.750" pilot tip
(Dodge P/N 4882358 or AA
P/N 52-0228 )
NOTE: All of the above input shafts will not work the 6.34:1 GM NV4500 transmission.
GM & DODGE FRONT RETAINERS:
On the front of the transmission, both the GM and Dodge transmissions
used a different front retainer. We offer some of these stock retainers as well as some modified retainers for use with our
adapter kits:
Dodge gas version transmission has a 5.600” index dia. with a 1.437” snout dia. P/N 716068 .
Dodge H.D. version transmission has a 5.600” index dia. with a 1.750” snout dia. P/N 716080 .
GM 1993-1995 transmissions have a 5.125” index dia. with a 1.377” snout dia. (we do not offer this retainer).
GM 1996-2004 transmissions have a 5.600” index dia. This retainer does not have a snout. We offer a bolt-on 1.377” snout,
P/N 716067A. We also offer replacement aluminum GM retainers under P/N 716068G .
14