Rubicon Express RE6160 - 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 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. It'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 caster 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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