Rubicon Express RE6165 - Manual (Page 2)

Photo 2
LIFT KIT TROUBLESHOOTING
REAR DRIVELINE:
Acceleration vibration: Caused by the pinion being too high in
relation to the transfer case output shaft. On leaf sprung
vehicles, install axle shims to lower pinion accordingly.
Deceleration vibration: Caused by the pinion being too low in
relation to the transfer case output shaft. On leaf sprung
vehicles, install axle shims to raise pinion accordingly.
Slip yoke vibration: Caused by excessive angle on the transfer
case slip yoke. Very common on vehicles with 2” or more of
lift. Lifts of 2”-3.5” can sometimes be cured with a transfer case
drop kit (pinion adjustment may also be required- see
acceleration and deceleration vibration troubleshooting above.
HIGH SPEED WOBBLE:
Fairly common with y-type steering on lifted XJ’s. 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. A good rule of thumb is minimum
factory caster and maximum factory toe in.
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.
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