JB Conversions 16-1201 HD Super Short SYE Kit for the NP231J - Manual (Page 5)

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9) Install the hub and sprocket assembly onto the new mainshaft
(Fig.8) followed by the new retaining ring. If your sprocket has needle
bearings located within the main bore, press them out and discard. It
is acceptable to delete these bearings. The deletion of these bearings
is per factory, NVG design.
FIG: 8
10) Verify the length of your mode fork shift rod as shown (Fig.9). If
your shift rod measures 10.2", it will need to be cut down to a length
of 9.380". This is typical to 1988 and 1989 model YJ's.
FIG: 9
11) Be sure the large hub ring is arranged as shown in the photo. It is
possible to install this ring in a reverse orientation therefore causing