Advance Adapters 50-6306 - Manual (Page 5)

ADVANCE ADAPTERS INC. P/N: 50-6306
P.O. Box 247, 4320 Aerotech Center Way Old Part No:
Paso Robles, CA 93447 PAGE 5 OF 5
Telephone: (800) 350-2223 Fax: (805) 238-4201 Page Rev. Date: 04-10-13
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.
GM 4WD TH350 AUTOMATIC TO JEEP NP231 T/C
21 SPL. upgrading to a 87-95 23 SPL.
Once the input gear is removed, you'll find a thrust washer that must be reinstalled onto the
new 23 spline input. When comparing the two input gears, they should look the same except
for the internal splines. If you find a difference between the two. The NP231 transfer case
used two styles of front input bearings. The early transfer case used a wide bearing and
the later model used a narrow bearing. This new input gear is designed for only the early
style case. New Process changed the bearing and gear pitch design in 1995. The center
photo below show a later model input compared to a early.
Once you have verified that you have the same style input gear, install the gear into the planetary, install the snap ring. Re-install the planetary
assembly into the case and secure the input to the bearing with the front snap ring. Note: The only part you should have left out of the case
is the old input gear. During reassembly, make sure the oil return hole matches the front retainer hole.
NOTE: This kit will not work
with a Tera low 4:1 NP231 kit.