Rough Country 680.20 - Manual (Page 3)

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.
High speed wobble:
This is fairly common with y-type steering on lifted XJ'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 posi-
tive caster 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 sup-
plied with the track bar. Next determine the neutral position of the steering wheel. Adjust the drag link to center the steer-
ing wheel
POST INSTALLATION INSTRUCTIONS
Check all fasteners for proper torque. Check to ensure there is adequate clearance between all rotating, mobile, fixed
and heated members. Check steering gear for interference and proper working order. Test brake system.
Perform steering sweep. Check to ensure brake hoses have sufficient slack and will not contact rotating, mobile, or fixed
members, adjust lines/brackets to eliminate interference and maintain proper working order. Failure to perform
inspections may result in component failure.
Bump stops and extensions must be in place on all vehicles! Note: allowing suspension to over extend by neglecting to
install or maintain stops and extensions may cause serious damage to OE and related components.
Re torque all fasteners after 500 miles. Visually inspect components and re torque fasteners during routine vehicle
service
.
MAINTENANCE INFORMATION
It is the ultimate buyers responsibility to have all bolts/nuts checked for tightness after the first 100 miles and then every
1000 miles. Wheel alignment steering system, suspension and driveline systems must be inspected by a qualified
professional mechanic at least every 3000 miles.
KIT CONTENT:
2-Front Coil Spacers
2-Rear Lifted Shackles
2-Front Shock Absorbers
2-Rear Shock Absorbers