Rubicon Express RE7003 - Manual (Page 3)

RI7003G Page 3 of 3
TROUBLESHOOTING
Rear driveline:
Acceleration vibration: Caused by the pinion being too high in relation to the transfer case output shaft. Adjust upper control arms or cam bolts (both
optional) to lower pinion accordingly.
Deceleration vibration: Caused by the pinion being too low in relation to the transfer case output shaft. Adjust upper control arms or cam bolts (both
optional) to raise pinion accordingly.
General vibration: Caused by excessive angle on the rear drive shaft. Very common on vehicles with 2” or more of lift. As a temporary fix, it may be
possible to install the included transfer case drop kit and use a standard drive shaft. Optional cam bolts (RE1475) allow some adjustment of pinion angle
and may help (see acceleration and deceleration vibration troubleshooting above). For best performance, install optional upper adjustable control arms
(RE3783), a slip yoke eliminator (SYE) kit (or CV yoke on RUBICON model) and CV drive shaft. Adjust pinion so it is 2 degrees below parallel with CV
drive shaft (see acceleration and deceleration vibration troubleshooting above). A transfer case drop kit can usually be omitted with a CV drive shaft.
High speed wobble:
This is fairly common with y-type steering on lifted TJ's. 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. A good rule of
thumb is minimum factory caster and maximum factory toe in. Note that lift heights increased with coil spacers (or taller coils) may exhibit wobble that
cannot be corrected with alignment.
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.