Installation instructions – JB Conversions 16-1200 HD Standard Length SYE Kit for the NP231 User Manual
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Applications:
• Use with Jeep NP231J transfer cases in TJ, YJ, and XJ
vehicles
• Compatible with GM NP231C & NP233C transfer cases
requiring Chrysler type speedometer pickup
• Compatible with Dodge NP231 requiring Chrysler type
speedometer pickup
Installation Instructions
Note: This kit can be installed without removing the transfer case
from the vehicle however it is recommended that the unit be removed
to ease installation of the SYE kit.
1) Secure the vehicle and remove the transfer case from the vehicle.
Drain the fluid from the case. Remove the rubber boot from the rear
bearing housing by prying or cutting the steel band. Remove the front
output yoke. A new locknut and rubber "star" washer is included in the
kit for reassembly.
2) Remove the dust shield from the mainshaft. This can be easily
accomplished by using a chisel to dent the dust shield collar area
(where the boot band was located) in two places at 180 degrees apart
then prying the shield loose using a screwdriver. Next remove the oil
seal from the rear bearing housing.
3) Remove the mainshaft-retaining ring using a pair of snap-ring
pliers. Remove the spacer below the retaining ring groove. (Fig.1).