JKS 2550 User Manual
Page 2
JKS Adjustable Coil Spacer Installation
PN 2550
Page 2 of 3
Installation
1. REMOVE REAR COIL SPRINGS
Remove the rear coil springs per the factory
service manual instructions for your vehicle.
HINT: A coil spring compressor is useful for
removal.
Depending on the application, it may be
necessary to completely or partially remove any
of the following components before spring can
be free from upper mount.
z
Shock Absorber
z
Swaybar
z
Track Bar
z
Lower Suspension Arm
2. PREPARE UPPER SPRING MOUNT
Pry the rubber bump stop (jounce bumper) free
from the bump stop holder.
Locate and remove the bolt that secures the
bump stop holder to the upper spring mount.
Remove the bump stop holder.
Remove the rubber isolator pad from the upper
spring mount. Also remove any dirt or debris
from the spring mount.
3. DRILL UPPER SPRING MOUNT
Remove the Adjuster Ring (B) and new Isolator
Pad (D) from the pre-assembled ACOS unit.
Rotate the Transfer Ring (A) on Threaded Tube
(C) until top of Transfer Ring is just below top
edge of tube.
HINT: Threaded Tube (C) is tapered on one
end to fit properly against the upper spring
mount. Other end of tube is recessed to
accommodate the Bump Stop Support (E).
Make sure tube orientation is correct!
Position the Threaded Tube (C) with Transfer
Ring (A) against the upper spring mount.
HINT: Tapered end of Threaded Tube must
contact spring mount to ensure Transfer Ring is
centered.
Temporarily secure the Threaded Tube (C) with
Transfer Ring (A) in place by inserting the
10mm x 110mm Cap Bolt (G) through Bump
Stop (F), Bump Stop Support (E), Threaded
Tube (C), and then threading into the hole in
center of upper spring mount. Bolt should be
snug, but do NOT tighten yet.
Rotate the Transfer Ring (A) on Threaded
Tube (C) until the pre-drilled holes are in the
2-, 6-, and 10-o’clock positions, with the
6-o’clock hole located towards the rear of
vehicle. See illustration below.
Mark the hole locations on the upper spring
mount using a transfer punch or equivalent.
Remove the ACOS components from the upper
spring mount.
Using a 1/4” bit, drill a pilot hole at each hole
location. Enlarge each hole with a 3/8” drill bit.
Paint any exposed metal on the upper spring
mount to prevent corrosion.
4. INSTALL ACOS ON UPPER
SPRING MOUNT
Position the Transfer Ring (A) against the upper
spring mount and align the mounting holes.
Insert a 5/16” x 1-3/8” Cap Bolt (H) through
each hole and secure with a 5/16” Nylock
Nut (I) from above the spring mount. Tighten
bolts until snug, then loosen 1/2 turn so that
Transfer Ring (A) is slightly movable by hand.
Apply medium strength threadlocker to the
upper threads of Threaded Tube (C). Thread
tube completely into Transfer Ring (A) until it
contacts the upper spring mount. This will
center the Transfer Ring on the spring mount.
Next insert the 10mm x 110mm Cap Bolt (G)
through the Bump Stop (F) and Bump Stop
Support (E), and thread into the hole in the
center of the upper spring mount. Bolt should
be snug, but NOT fully tightened yet.
Now tighten the 5/16” x 1-3/8” Cap Bolts (H) to
40 ft-lb. using a torque wrench.
IMPORTANT: The Transfer Ring (A) must rest
completely flat against the upper spring mount.