JKS 6100 User Manual
INSTALLATION
INSTRUCTIONS
517-278-1226 • tech@jksmfg.com • www.jksmfg.com
491 W. Gareld Avenue, Coldwater, MI 49036
Product: Adjustable Lower Control Arms
Part Number: JKS6100
Applications: Wrangler TJ, 1997-06 (front or rear)
Gr. Cherokee ZJ, 1993-98 (front or rear)
Grand Cherokee WJ, 1999-04 (front only)
Cherokee XJ, 1984-01 (front only)
Comanche MJ, 1986-92 (front only)
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 the weight of the
vehicle when the hardware is torqued; or else ride
comfort could be affected and premature bushing
wear may occur.
Welcome
CONGRATULATIONS on purchasing a set of new
Adjustable Control Arms from JKS Manufacturing. We
are committed to providing you with the best products
available and your satisfaction is our rst priority.
PLEASE READ these Installation Instructions carefully, and save them for future reference, as they contain
important installation and maintenance information.
Tools Required
Metric/Standard Socket Wrench Set
Torque Wrench
Tape Measure
Anti-Seize Lubricant
Hydraulic Floor Jack & Jack Stands
Heavy Duty Ratchet Strap *
Factory Service Manual (recommended)
* Asterisk denotes tools that are not required for some applica-
tions. Thoroughly read instructions rst to determine which tools
will be required for your application.
RUBBER BUSHINGS MUST NEVER BE LUBRICATED, as doing so will impair performance and
longevity.
COMPATIBLE WITH original 4-link suspension
conguration and vehicle ride height up to 6.0”.
REFER TO FACTORY SERVICE MANUAL for
information and procedures not covered in these
instructions.
ATTENTION INSTALLER
Install Adjustable Control Arms ONE AT A TIME
for easiest alignment of mounting hardware.
Installation
1. REMOVE ORIGINAL LOWER
SUSPENSION ARM
Raise and support the vehicle chassis with jack
stands.
 FRONT INSTALLATION – Position behind
front lower suspension arm brackets.
 REAR INSTALLATION – Position in front of
rear lower suspension arm brackets.
JKS6100JKS Adjustable Control Arm Installation
Page 1
Raise the axle housing back into position and sup-
Use flat washer shims
to fill void between
bracket and bushing
VOID
9/16” SAE
FLAT
WASHER
port 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 lower suspension arm nut and bolt
from the axle housing bracket. Retain the original
mounting hardware.
 FRONT INSTALLATION – If front axle is equipped
with cam adjusters (see illustration below), scribe
or paint alignment marks for re-installation reference.
GRAND CHEROKEE WJ NOTE
IMPORTANT NOTE REGARDING FLAT WASHER
SHIMS FOR GRAND CHEROKEE WJ MODELS
The factory suspension arm brackets on the chassis and
axle are wider than the Adjustable Control Arm bushings.
Therefore, it will be
necessary to insert
at washer shims
between the bracket
and bushing to ll this
void as illustrated.
Flat washers are supplied with rear Control
Arms
(PN 6125) only.
Enough washers are
included with PN 6125
for both front and rear
Control Arms.
Remove the nut and bolt from the chassis rail
bracket. Retain the original mounting hardware.
Remove the original lower suspension arm from
the vehicle.
2. SET CONTROL ARM LENGTH
Adjustable Control Arms are fully collapsed when
supplied from JKS and must be adjusted to the desired lengths before installation.
The working length of each lower Control Arm can be
increased (up to 2.25” longer), decreased (up to 1.0”
shorter), or exactly the same as the OE suspension
arm.
Determine ideal Control Arm length for your ap-
plication by considering factors such as:
 Length of OE suspension arm
 Tire Clearance
2 Page
 Pinion Angle / Caster
 Rotate adjustable end of Control Arm until the
desired length is achieved.
Adjust corresponding Control Arm to exact same
length.
If you are not installing rear control arms
at this time, you
can source the at
washers (9/16” SAE)
for your front Control
Arms from your local
hardware store.
3. INSTALL CONTROL ARM
Apply anti-seize lubricant to bolt threads of original
mounting hardware.
Mount the non-rotating (BLACK) end of Adjustable
Control Arm to the chassis rail bracket with the
greaseable tting facing UP.
Install the original mounting bolt and nger tighten
the nut. DO NOT torque mounting hardware
until instructed.
JKS6100
 GRAND CHEROKEE WJ ONLY - Insert two
(2) at washer shims – one on each side of
bushing – to ll the void between the chassis
bracket and Control Arm bushing. H INT: Flat
washers must be installed to ensure proper
bushing performance and reliability.
JKS Adjustable Control Arm Installation
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