D. Torque all bolts to factory specs and double-check your work.
E. Test drive and note location of steering wheel and any driveline vibrations.
F. Adjust drag link to center steering wheel and align vehicle as soon as practical. Minimum factory caster and maximum factory toe-
in seems to work well with these front ends (see Troubleshooting as well).
G. Adjust control arms if necessary. Note: Due to vehicle variations, installer must verify proper drive line angles and axle placement
to avoid tire rubbing or axle coming in contact with gas tank, steering linkage, or exhaust system. Shown below is picture
showing proper pinion angle for a CV style drive shaft (see Troubleshooting as well).
H. Retighten all bolts after 50 miles and again after every off road excursion.
TROUBLESHOOTING
Rear driveline:
Acceleration vibration:
Caused by the pinion being too high in relation to the transfer case output shaft. Adjust upper control arm to lower
pinion accordingly.
Deceleration vibration:
Caused by the pinion being too low in relation to the transfer case output shaft. Adjust upper control arm to raise
pinion accordingly.
Slip yoke vibration:
Caused by excessive angle on the transfer case slip yoke. This is not uncommon on lifted vehicles with some miles on
them. For best performance on NP231 and NP242 transfer cases, install a slip yoke eliminator (SYE) kit and CV drive shaft. For best
performance on the NP249 transfer, install new yokes and a standard two U-joint drive shaft in front and install an SYE and CV drive shaft
in the rear. Adjust pinion so it is about 2 degrees below parallel with CV drive shaft (see acceleration and deceleration vibration
troubleshooting above).
High speed wobble:
It is a condition where front tires will shimmy after hitting a bump. Avoid bias ply tires and wheels with excessive offset. Check for worn or
loose parts. In most cases a reduction of positive castor will eliminate this condition.
Bump steer: Caused by improper relationship of drag link and track bar. To correct, center axle again following the instructions supplied
with the track bar. Next determine the neutral position of the steering wheel. Adjust the drag link to center the steering wheel.
RI8300 Page 7 of 7
(1 pages)
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