JKS PN 2400 User manual

JKS Adjustable Spring Mount Installation PN 2400 Page 1 of 2
Installation
Instructions
Product: Adjustable Rear Spring Mounts
Part Number: PN 2400
Application: Jeep Wrangler JK, 2007+ (rear)
Welcome
CONGRATULATIONS on your purchase
of new JKS Adjustable Spring Mounts! At 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.
Tools Required
Hydraulic Floor Jack and Jack Stands
Metric/Standard Socket Wrench Set
Torque Wrench
Tape Measure
Die Grinder with Cut-Off Wheel
(for removing factory spring mounts)
Grinding Wheel
Satin Black Spray Paint
Angle Measuring Tool
Anti-Seize Lubricant *
Factory Service Manual (recommended)
* Asterisk denotes tools that are not required for some
applications. Thoroughly read instructions first to
determine which tools will be required for your
application.
Installation
1. REMOVE REAR TRACKBAR AND
COIL SPRINGS
Raise and support the vehicle chassis with jack
stands positioned in front of the rear lower
suspension arm brackets.
Raise and support the rear axle housing with a
hydraulic jack to relieve tension from the track
bar mounting hardware.
Remove the rear track bar mounting hardware
from the axle and chassis brackets. Retain
original hardware and remove rear track bar
from vehicle.
Remove the rear stabilizer bar drop link
mounting hardware from the axle housing.
Disconnect drop links from axle and retain
original hardware.
Remove the lower mounting hardware from the
shock absorbers and disconnect shocks from
axle brackets. Retain original hardware.
Lower the rear axle housing until the coil
springs are free from the upper spring mounts.
Remove coil springs from vehicle.
2. REMOVE FACTORY SPRING
MOUNTS FROM AXLE
Inspect the factory spring mount on the axle
housing. Locate the areas that are welded to
the axle tube.
Cut the factory spring mount off of the axle
housing. Use care to avoid cutting into the axle
tube. HINT: A die grinder with cut-off wheel is
useful for cutting off the factory spring mount.
Remove any remaining spring mount material
from the axle housing until surface of axle tube
is smooth. HINT: A grinding wheel is useful for
removing remaining spring mount material.
Locate the long factory weld on front (driver
side) of rear axle tube.
On outboard side (closest to tire) of weld, grind
off 2” of material until smooth and flush with
surrounding area.
With the factory spring mounts removed and the
long factory weld shortened, paint bare metal
on axle tube to prevent corrosion.

JKS Adjustable Spring Mount Installation PN 2400 Page 2 of 2
3. INSTALL ADJUSTABLE SPRING
MOUNTS ON REAR AXLE
Install optional JKS Spring Retainer PN 1600
(recommended – sold separately) at this time if
purchased.
Place coil spring on Adjustable Spring Mount
and position assembly on axle housing. Make
sure original rubber isolator pad is located
between upper spring mount and top of coil.
IMPORTANT: Adjustable Spring Mount
bracket must be installed with rounded side
facing forward and flat side facing the rear
as illustrated above. On driver side of
vehicle, notch in Adjustable Spring Mount
bracket will line up with the track bar
bracket as illustrated below.
Slide Adjustable Spring Mount bracket outboard
on axle tube until it is as close to the factory
bump stop pad as possible. HINT: Stop when
bracket contacts factory weld between bump
stop pad and axle tube.
Using the supplied U-bolts, loosely fasten
Adjustable Spring Mount bracket to axle tube.
Do not tighten U-bolt nuts yet.
Rotate Adjustable Spring Mount bracket to
desired position on axle tube. HINT: When
positioned properly, Adjustable Spring Mounts
will allow full suspension travel without
excessive bowing of coil springs. Check for
interference between coil springs and track bar.
Measure mounting angle of bracket to ensure
both sides are identically adjusted. HINT: Use
an angle measuring tool to accurately record
mounting angle of Adjustable Spring Mount
bracket.
With Adjustable Spring Mount correctly
positioned, evenly tighten the U-bolt mounting
nuts until bracket is secure.
Using a torque wrench, tighten U-bolt nuts to 50
ft-lbs.
Slowly raise the rear axle housing with a
hydraulic jack. Make sure top of coil spring is
properly seated in the upper spring mount.
Connect shock absorbers to axle housing using
original mounting hardware. Tighten shock
mounting bolts to 56 ft-lbs.
Connect the rear stabilizer bar drop links to axle
housing using original mounting hardware.
Tighten hardware to 75 ft-lbs.
4. REINSTALL REAR TRACK BAR
Apply anti-seize lubricant to bolt threads of
original track bar mounting hardware.
Insert axle end of track bar into axle bracket
and loosely install the original mounting
hardware.
Mount chassis end of track bar and loosely
install the original mounting hardware.
IMPORTANT: The vehicle must be on level
ground and the coil springs supporting the
full vehicle weight before the mounting
hardware is tightened.
Using a torque wrench, tighten mounting
hardware at both ends of track bar to 125 ft-lbs.
Maintenance
Check torque specifications regularly.
©2009 JKS Manufacturing, Inc & Aftermarketing, LLC
Revision Date 1/8/2009