How to Install Zone Offroad J-Flex Adjustable Rear Upper Control Arm for 0-6 in. Lift (07-18 Wrangler JK) on your Jeep Wrangler

CONGRATULATIONS on purchasing a set of new Control Arms from JKS Manufacturing. We are committed to providing you with the best products available and your satisfaction is our first priority.

PLEASE READ these Installation Instructions carefully, and save them for future reference, as they contain important installation and maintenance information.

Important

SUSPENSION COMPONENTS THAT HAVE RUBBER BUSHINGS must be tightened with vehicle on level ground and at normal ride height. The springs must be supporting weight of vehicle when the hardware is torqued.

RUBBER BUSHINGS MUST NEVER BE LUBRICATED, as doing so will impair performance and longevity.

COMPATIBLE WITH original 4-link suspension configuration and vehicle ride height up to 4.5”.

REFER TO FACTORY SERVICE MANUAL for information and procedures not covered in these instructions.

Install Control Arms ONE AT A TIME for easiest alignment of mounting hardware.

1. REMOVE ORIGINAL upper SUSPENSION ARM

Raise and support the vehicle chassis with jack stands positioned in front of the rear lower suspension arm brackets.

Raise the axle housing back into position and support with a hydraulic jack. HINT: The axle housing should be evenly supported and the suspension at normal ride height. Do not attempt removal or installation with the suspension extended, or the axle drooped, as this will place tension on suspension arm mounting hardware.

Remove the upper suspension arm bolt and nut from the axle housing bracket. Retain the bolt and nut

Remove the bolt and flag nut from the chassis rail bracket. Retain the bolt and flag nut.

Remove the original lower suspension arm from the vehicle.

Proceed to step 2. Complete installation on one side before starting other side.

2. SET CONTROL ARM LENGTH

Determine the ideal arm length for your application by considering factors such as:

Pinion Angle

Tire Clearance

Factory length is 17-1/2"

Max. length is 19"

Set both control arms to the same length. Lengthening the arms will increase pinion angle.

3. INSTALL CONTROL ARM

Apply anti-seize lubricant to bolt threads of original mounting hardware.

Establish control arm orientation. The arms should be mounted so that the bend goes inward (away from the tire) and the rubber bushing end mounts to the axle.

Mount the rubber bushing end of the control arm to the axle housing bracket. Install the original mounting bolt and finger tighten the nut. DO NOT torque mounting hardware until instructed.

Mount the control arm to the frame bracket with the grease fitting down. Install the original mounting bolt and flag nut. Finger tighten the bolt.

HINT: If mounting bolt is difficult to install due to misalignment of Control Arm bushing with mounting bracket, either (1) adjust height of axle housing with hydraulic jack, (2) move axle housing into position with a heavy-duty ratchet strap, or (3) temporarily disconnect track bar until mounting holes align.

4. TIGHTEN MOUNTING HARDWARE

Once both control arms have been properly installed, lower the vehicle to the ground until coil springs are supporting the full weight of vehicle.

Using a torque wrench, tighten all mounting hardware to 125 ft-lbs.

Tighten jam nuts using JKS1696 or equivalent.

5. P OST-INSTALLATION INSTRUCTIONS

Check mounting hardware for proper torque.

Check hardware after 500 miles of use.

Maintenance

Control arm flex ends should be greased regularly as part of vehicle maintenance schedule or after every 4-wheeling trip. Lubricate using marine grade grease. Rubber bushings require no maintenance.