Rugged Ridge NP231 Slip Yoke Eliminator (SYE) Kit, 88-06 Jeep Wrangler - Manual (Page 4)

STEP 8: Be sure all parts are clean and serviceable. Prelube all parts before installation.
Place the mode hub, sprocket, and retaining ring into position on the new shaft. NOTE:
you may need to remove cage bearings from the drive sprocket on early NP231J.
See diagram above. These bearings will not be needed – Discard.
Photo 3. Mode hub, drive sprocket, and retaining ring positioned on the new main shaft.
These parts are now ready to re-install.
AGAIN !! (Early model 231’s might require
the removal of the needle bearing cage from the drive sprocket before it can be
installed. Discard needle bearing cages as they are no longer needed.)
STEP 9: With the case disassembled inspect the mode fork shift rod (see image above).
If the shift rod measures 10.2” than you will need to cut it down to a length of 9.380”.
This has been found to be a common problem for 1988- 1989 YJ models. You will need
to cut the shift rod at the end located on the back side of the transfer case (Yoke side).
Make sure that after cutting all burs and ruff edges have been cleaned.
STEP 10: Lubricate the shaft assembly, chain, and shaft bearing surfaces. Install the
main shaft assembly into the front case half planetary assembly. Place the front output
shaft on the chain and work them into position with the main shaft and case. Once they
are properly located replace the mode spring onto the shift rail.
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