Rubicon Express RE7500 SERIES - Manual (Page 8)

RE7500A Page 8 of 8
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, install a slip yoke eliminator (SYE) kit and CV drive shaft. 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. NOTE: A
drop pitman arm should NOT be used on kits using the RE1600 front track bar in the factory mounts, as this will cause bump steer.