Rubicon Express RE7000 - Manual (Page 3)

RI7000 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 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.
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. For best performance, install a slip yoke eliminator (SYE) kit (or
direct fit CV driveshaft on RUBICON model), CV drive shaft and an RE1602 rear track bar bracket for CV’s. 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.