Rough Country 390 - Manual (Page 2)

FRONT SUSPENSION INSTALLATION
1. Secure and block the rear tires of the vehicle on a level concrete or asphalt surface
2. Raise the front of the vehicle and support the frame with jack stands. Position the jack under the axle to raise and
lower the front suspension.
3. On both sides of the vehicle, scribe alignment marks on the adjustment cam and axle bracket at the lower link to
axle attachment point for later reference.
4. Unbolt the brake line brackets from the control arm mount on the axle using a 13mm wrench to ensure brake line
free play during the suspension system installation.
See Photo 1.
7. The new control arms will be installed one side at a time on the vehicle. This is done to make it easier to remove
the hardware from the arms and to not cause bind in the front suspension. Remove the lower suspension arm nut,
cam, and cam bolt from the axle using a 21mm and a 24mm socket and wrench. Remove the nut and bolt from the
frame attachment point and remove the lower suspension arm from the vehicle.
See Photo 2. Retain hardware for
reuse.
8. Using a 21mm socket remove the upper control arm from the axle and frame. Note —the passenger side upper
control arm frame bolt will have to be cut or remove the exhaust before the bolt can be removed.
9. Use a cut off wheel on a die grinder and cut the welds around the lower control arm frame bracket. The frame
bracket has to be removed to allow clearance for the new longer arms.
See Photo 3.
10. After the factory bracket has been removed grind the frame smooth and paint to prevent rust.
11. Support the transmission cross member with a jack and remove the two bolts on end with a 18mm socket and a
21mm wrench.
12. Install the new lower control arm mount with the supplied 14mm x 200mm long bolts. Do not tighten at this time.
Hold the bracket up close to the frame and use a transfer punch to mark the frame.
See Photo 4. Drill the frame
with a 17/32 ” drill bit (clearance for the new 1/2” bolts). Remove the two bolts and the new control arm bracket
from the cross member.
Photo 1 Photo 2
Photo 3 Photo 4