Advance Adapters 50-7906B - Manual (Page 10)

ADVANCE ADAPTERS INC.
P/N: 50-7905, 50-7906 & 50-7906B
P.O. Box 247, 4320 Aerotech Center Way New Item: (12/98)
Paso Robles, CA 93447 PAGE 10 OF 12
Telephone: (800) 350-2223 Fax: (805) 238-4201 Page Rev. Date: 07-31-07
SPECIAL NOTE: The components packaged in this kit have been assembled and machined for specific type of conversions. Modifications to any of the
components will void any possible warranty or return privileges. If you do not fully understand modifications or changes that will be required to complete your conversion,
we strongly recommend that you contact our sales department for more information. This instruction sheet is only to be used for the assembly of Advance Adapter
components. We recommend that a service manual pertaining to your vehicle be obtained for specific torque values, wiring diagrams and other related equipment.
These manuals are normally available at automotive dealerships and parts stores.
NP231 SHORT SHAFT "FIXED YOKE" KIT
(Fig. 9A) Speed-o- Ring Gear Install
(8) Assemble speed-o-drive
(a) Install retaining ring, located just behind the pump.
(b) Slide ring gear into position.
(c) Install retaining ring behind ring gear. (Fig. 9A)
(Fig. 10A) Bearing Installed
and Retained with the 716464
Snap Ring
(10) Short Tailhousing Installation:
(a) Prelube bearing & seal in new short tailhousing assembly.
(Fig. 11A)
(b) Apply sealant to tailhousing, mating surface of rear case.
(thin film)
(c) While supporting main shaft, slide new tail assembly into
position.
(d) Use care when indexing pump outer tabs and aligning tail
assembly for installation. (Fig. 12A) NOTE: Pull back on
the output shaft to seat it against the rear bearing.
(e) Install the (5) 10mm bolts that retain the tailhousing and
torque evenly to 20-27 N.m (15-20 ft./lbs.)
(Fig. 12A) Tailhousing Installation
(Fig. 11A) Seal
Installed
NOTE: On some NP231 transfer cases, the shift rail must be shortened.
This shift rail protrudes out of the transfer case and goes into the
tailhousing. The new tailhousing has a pocket depth of 1.125".
Shift your transfer case into 4WD so the shift rod is protruding the
furthest out of the transfer case. If this shifter rod protrudes more than
1" out of the back side of the transfer case, then the shift rail must be
shortened. Ideally the shift rod should protrude exactly 1".
Transfer cases that will normally require this rail to be shortened
measure 1.5" (photo above left).
Using a hack saw or cutoff wheel (and safety glasses), trim the shift
rail shaft so that it protrudes only 1" (photo above right).
This kit is designed for both the Cherokees and Wranglers. The
Cherokees use a vacuum actuator on the New Process tailhousing; our
casting has this provision. On Wranglers, this threaded hole must be
plugged. We have provided a plug and washer for this purpose. We
also recommend that you use a bit of silicone to properly seal the plug.