JB Conversions 16-1200 User Manual

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HD Standard Length

SYE Kit for the NP231

Manufactured by JB CONVERSIONS, INC.

Phone: [phone]

Installation Instructions for the

NP231 Transfer Case

Part No. 16-1200-1942 (w/1310 CV Yoke)
Part No. 16-1200-1946 (w/1350 Non CV Yoke)
Part No. 16-1200-1966 (w/1350 Rear Output Flange)

Instruction Rev: 2010.03.10-02

Installed photo.

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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).

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FIG: 1

4) Remove the speedometer sending unit from the rear housing.
Remove the bearing housing (Fig.2) from the rear case half to expose
the pump (Fig.3).

FIG: 2 FIG: 3

5) Remove the 10mm hex bolts holding the rear case half to the front
half and separate the two halves. The pump may stay on top of the
rear case half as the rear case half is lifted off of the front half.

6) Remove the spring from the top of the mode fork (Fig.4).

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FIG: 4