JKS 2550 User Manual

Important

Parts

MOST VEHICLES REQUIRE additional parts

Installation

Instructions

Product: Adjustable Coil Spacer (ACOS™)

Part Number: PN 2550

Welcome

CONGRATULATIONS on your purchase
of a new JKS ACOS™ system! 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.

JKS Adjustable Coil Spacer Installation PN 2550 Page 1 of 3

or modifications to accommodate the
immediate increase in ride height provided by
the ACOS system.

DO NOT EXCEED maximum range of
adjustment – see illustration on page 3.

Tools Required

 Metric/Standard Socket Wrench Set
 Torque Wrench
 8mm, 1/4" & 5/16” Allen Wrenches
 Tape Measure
 Medium Strength Threadlocker
 Spray Lubricant (WD-40 or similar)
 Anti-Seize Lubricant
 Hydraulic Floor Jack
 Transfer Punch (or equivalent)
 1/4” and 3/8” Drill Bits
 Coil Spring Compressor *
 Satin Black Spray Paint *
 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.

DESCRIPTION QTY

Transfer Ring 2

A

Adjuster Ring 2

B

Threaded Tube (gold) 2

C

Isolator Pad 2

D

Bump Stop Support 2

E

Bump Stop 2

F

10mm x 110mm Cap Bolt 2

G

5/16” x 1-3/8” Cap Bolts 6

H

5/16” Nylock Nuts 6

I

PN 2200 (front application) pictured

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
edge of tube.

HINT: Threaded Tube (C) is tapered
end to fit properly against the upper spring
mount. Other end of tube is recessed
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
vehicle. See illustration below.

below top

on one

to

of

 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.

JKS Adjustable Coil Spacer Installation PN 2550 Page 2 of 3