6 3/8” SAE Flat Washer Air spring to trailing arm and to upper mount
4 3/8” USS Nyloc Jam Nut Air spring to upper mount
5 5/16” x 1 ¾” USS Bolt Panhard bar axle bracket to axle cover
5 5/16” Lock Washer Panhard bar axle bracket to axle cover
5 5/16” USS Flat Washer Panhard bar axle bracket to axle cover
2 ¾ X 4” SAE Gr.8 Bolt Trailing Arm to cross member
2 ¾ SAE Gr.8 Nyloc Nut Trailing Arm to cross member
ARR21800-LCA Installation Instructions
1. Raise the vehicle to a safe and comfortable working height. Let the rear suspension hang
freely.
2. Remove the bed.
3. Raise the axle a couple inches and support it so that it cannot rotate. Remove the trailing
arms, coil springs, shock absorbers, and panhard bar. Refer to the factory service manual
for proper disassembly procedures. Note: This kit is designed for use with a 1-piece drive
shaft.
4. The factory trailing arm frame
cross member will be replaced with
the tubular one supplied. To remove
the factory cross member, the rivets
must be removed. The easiest
method is to chisel them off with an
air hammer. Then use a hammer
and punch to drive the rivets out.
Note: On each side there is one rivet
in front of the cross member and one
behind that must also be removed for
the new cross member.
5. Install the new cross member with
the trailing arm flanges towards the
rear. The cross member is bolted to
the bottom side of the frame rails
using 10 - 7/16” x 1” bolts, 10 - 7/16”
Nylok nuts and 20 - 7/16” flat
washers. It may be necessary to
enlarge some of the holes with a
7/16” bit.
Note: On short bed trucks you may
have to raise the cab to remove the
factory cross member.
6. The factroy upper shock cross
member must also be removed to
allow for the new upper shock cross
member and “C” Notch.
7. On the driver side of the rear
frame cross member; these two rivets
must be removed before installing the
“C” notch.
8. The lower rear rivet on this
reinforcement plate must also be
removed to mount the notch.
9. The “C” notch will be used as a
template for notching the frame rail.
Hold the “C” notch up to the outside
of the frame with the holes in the
notch aligning with the holes in the
frame.
10. While holding the notch in place,
trace the inside edge of the notch.
Then scribe a second outline ¼”
larger than the first to allow for the
thickness of metal.
11. Drill a ½” hole at the two corners
of the outline as shown in the picture.
This will give you a round edge and
reduce the possibility of stress
fractures.
12. Cut along the outline with a
sawzall, cut off wheel, or plasma
cutter. Then grind all edges smooth.
13. Slide the notch over the frame.
The holes in the top of the notch
should align with the factory shock
cross member holes. There are also
two larger holes on the outside of the
frame rail that will align with two holes
in the frame. Insert 5/8” x 1 ½” bolt,
Nylok nut and flat washer in each
hole to secure the notch. Then use
notch as a template to drill the rest of
the holes with a 7/16” bit. 7/16” bolts,
Nylok nuts and flat washers are
supplied. Some holes will use a 1”
bolts and some will use an 1 ¼”.
14. The upper air spring plate is built
into the notch. But the two inner 3/8”
holes will need to be into the frame
using the notch as a template.
15. A 1” x 1” portion of the frame
must be removed for air fitting
clearance. (Shown in the picture to
the left).
16. Install the medium bump stops
into the notch. A 3/8” Nylok nut and
flat washer will secure it. This picture
is shown with the short bump stop.
Note: If you wish to lower the vehicle
an additional 1” you can install a
shorter bump stop, but this will
require cutting the bed floor to allow
clearance for the differential housing.
(Also requires a shorter shock part#
MON33033 & ½” lower studs.)
Note: Check bed to differential
housing clearance. A couple
washers may be required between
the bump stop and notch to provide
adequate clearance.
17. The new upper shock bridge is
bolted in place using 6- 7/16” x 1 ¼
bolts, Nylok nuts and flat washers
between the notches on the bottom
side of the frame rail.
Note: There are four holes on each
side of the bridge; only 3 will be used.
18. The Stongarms are a direct
replacement of the factory trailing
arms an will bolt to the new tubular
cross member using two 3/4” x 4”
bolts, Nylok nuts and flat washers.
These bushing are polyurethane and
are already lubricated with lithium
grease. Future lubrication can be
done with any non-petroleum based
lubricant.
Note: There is a driver and
passenger side arm. The tabs for the
shock bridge will point towards the
center of the vehicle.
19. Bolt the other end of the
StrongArm to the axle using the new
U-bolts supplied.
20. Apply thread sealant to a 90degree air fitting and screw it into the
top of the air spring. The threads are
already coated with a thread sealant
but we recommend additional
sealant.
21. Secure the air spring to the notch
using two 3/8” Nylok jam nuts and flat
washers.
22. Fasten the bottom of the air
spring to the StrongArm using one
3/8” x 3” bolt, flat washer and lock
washer.
23. Install the 5/8” shock studs into
the upper & lower shock bridge.
24. Install the lower shock bridge
between the trailing arms using two
5/8” x 4” bolts and Nylok nuts. The
shock tabs will point down.
25. The lower shock bridge will use
the ½” shock studs.
26. Bolt the new shock absorbers to
the upper and lower studs using the
nuts and washers supplied.
27. To install the panhard bar
remove 5 bolts from the right half of
the axle cover. Place the panhard
axle bracket over the cover and
secure with 5/16” x 1 ¾” bolts, flat
washers and lock washers.
28. Slide the heim end over the stud
and then the spacer. Secure the
assembly with a 5/8” Nylok jam nut.
29. The other end of the panhard bar
will bolt into the factory mount with a
5/8” x 2 ¾” bolt and Nylok jam nut
supplied.
30. The StongArms have a tab of the
outside of each one for attaching the
parking brake cable.
Note: This system is designed for
use with a 1-piece drive shaft.
30. Driving height on this air spring is
approximately 5” tall. This may vary
to driver preference.
31. Make sure that the air spring
does not rub anything. Allowing this
will cause air spring failure and is
not a warrantable situation.
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