Air Lift Performance MN-643 User Manual
Kit No. 39205
Please read these instructions completely before proceeding with installation
MN-643
(02511)
ECR 5461
Parts List
Item P/N Description Quantity
A 26391 Driver-Side Beam Assembly 1
B 26414 Passenger-Side Beam Assembly 1
C 26380 Panhard Rod Assembly 1
D 07138 Upper Bracket (Right) 1
E 07137 Upper Bracket (Left) 1
F 58201 Bellows 2
G 17247 1/2” - 13 x 1.75” Bolt GD8 14
H 18485 1/2” Flat Washer 28
I 18460 1/2” - 13 Nylock Nut 16
J 17268 10mm Bolt GD8.8 8
K 18495 10mm Nylock Nut 4
L 13228 Spacer 2
M 10308 U-Bolt 2
N 18509 Washer .65ID x 1.25OD 4
O 18508 5/8” - 18 Nut 4
P 18451 3/4” - 16 Jam Nut 2
Q 18484 1/2” - 20 Hex Nut GD8 4
R 18429 1/2” - Lock Washer 6
S 21745 1/4” MNPT x 1/4” Tube Straight 2
T 18480 9/16” Nylock Nut 1
Y 17219 9/16” - 12 x 5 Bolt GD8 1
Z 13034 Spacer 2
AA 20086
sub Air Line Assembly 1
Item P/N Description Quantity
BB 10466 8” Zip Tie 6
CC 21230 Poly Cap 2
DD 18405
EE 21234 Rubber Washer 2
FF 18411
GG 21233
HH 17269 3/4” - 16 x 4” Bolt GD8 1
II 18518 3/4” Flat Washer GD8 2
JJ 18470 3/4” - 16 Nylock Nut GD8 1
KK 18435 3/8"-16 Nylock Nut 2
LL 10195 Flat Washer , 2.5" OD x .53 ID x .19 4
MM 17271 1/2"-13 X 3, Hex Cap Screw 2
NN 17307 5/8” - 18 x 6.5 Bolt 4
OO 18509 1.25” OD Flat Washer 8
PP 18536 5/8” Nyloc Nut 4
QQ 17305 22mm Bolt 1
RR 18535 22mm Flat Washer 2
SS 18534 22mm Nyloc Nut 1
TT 10513 Axle Bracket 1
UU 17286 Centering Pin 1
VV 10642 Spring Retainer 1
W W 10445 Limiting Strap 1
5
/16" Flat Washer 2
5
/16" Star Washer 2
5
/16" Hex Nut 4
Read all maintenance guidelines on page 7 before operating the vehicle.
Technical Support
1-800-248-0892
Ext. 2
1
DANGER:
Compressed air can cause injury and damage to the vehicle and parts if it is not handled properly. F or your
safety, do not try to inflate the air springs until they have been properly secured to the vehicle.
Passenger-Side
Nut
Spring Retainer
Remove Frame
Contact Overload
Upper Bracket
Remove Bolts
Rivet
Driver-Side Only
Axle
Figure 1
Centering Pin
Remove Gas
Tank Cover
Stock Bolt
I. Getting Started
1. Elevate the rear of the vehicle and secure the frame with jack
stands.
2. Remove both of the leaf springs.
NOTE: Retain the front n uts and bolts to be reused.
3. Remove the rear contact overload frame brackets from both sides
of the frame rail.
4. Remove the bottom gas tank cover from the vehicle.
5. Remove the two bolts above the rivet on the driver-side of the
frame rail (Figure 1).
II. Attaching the Axle Beams
1. Attach the spring retainer (VV) to the passenger side beam using
the centering pin (UU). Tighten securely (Figure 2a).
2. Install the passenger-side beam assembly (A) to the front spring
eye hanger using the supplied 16mm bolt (KK), flat washers
(LL), and nyloc nut (MM). Leave loose at this time.
Figure 2a
22 mm flat washer and
22 mm nyloc nut (behind beam)
22 mm bolt
Driver-Side Beam
5/8" flat washer
5/8" bolt
5/8" flat washer
5/8" nyloc nut
Axle
stock retainer
Figure 2b
22 mm flat washer
Axle Bracket
3. Attach the passenger side beam assembly to the axle with Ubolts (M), flat washers (N), and nuts (O) (Figure 2a). Torque to
128 ft/lbs.
4. For the driver-side, set the axle bracket (TT) onto the top of the
axle. Insert the bolts (NN) through the flat washers (OO), the
axle bracket, and the stock spring retainer. Fasten using flat
washers (OO) and nyloc nuts (PP) (Figure 2b).
5. Tighten and evenly torque to 128 ft/lbs.
6. Set the beam assembly onto the axle bracket. Insert the bolt
(QQ) through one flat washer (RR) and through the front of the
beam assembly. Fasten using a flat washer (RR) and a nyloc
nut (SS) (Figure 2b). Leave loose at this time.
NOTE: Index the alignment pin into the spring perch hole before
applying torque.
Technical Support
1-800-248-0892
2
Ext. 2
Driver-Side Shown
10mm Bolts
1/2" Bolts
Drill
1/2" Hole
Drill
1/2" Hole
Bolt
Spacer
Jam Nut
Flat Washer
Top View
Passenger-Side
Bolt
Flat Washer
III. Attaching the F rame Brac kets
1. Install the passenger-side frame bracket (D) using the existing
holes from the previously removed frame contact overload
bracket. Attach using four bolts (G), eight flatwashers (H), and
four nylock nuts (I). Tighten securely.
NOTE: Be sure the bracket flange is tight to the bottom frame
flange. Clamp tightly using a pair of vice grips.
2. Attach the driver-side frame bracket (E) following the instructions
in the previous step.
3. Install two 10mm bolts (J) above the rivet on the driver-side frame
rail (See section I step 5). Tighten securely.
4. It will be necessary to drill two 1/2” holes through the driver-side
frame rail to completely attach this bracket.
NOTE: It may be necessary to raise the chassis up to obtain
clearance when drilling.
Using the mounted bracket as a template, drill a hole through the
front-most hole in the bracket. There is already an e xisiting slot
in the frame that will be enlarged (Figure 3).
5. Attach using one 1/2” bolt (G), two flat washers (H), and one
nylock nut (I). Tighten securely.
6. Using the bracket as a template, drill the remaining hole under
the frame flange in between the two panhard rod mounts (Figure
3). Attach using one 1/2” bolt (G), two flat washers (H), and one
nylock nut (I). Tighten securely.
IV. Attaching and Adjusting the Panhard Rod
1. Attach the panhard rod assembly (C) to the driver-side frame
bracket using one 9/16” bolt (Y), two flat washers (H), and one
nylock nut (T). Leave loose at this time.
Figure 3
Figure 4
2. Lift or drop the rear of the frame so that it measures 31” from the
3. Measure the distance between the tire and the frame. Pry the
4. Adjust the hyme joint and attach it to the passenger-side beam
5. T urn the hyme joint so as to sta y on the “ball” section throughout
6. Tighten the 9/16” panhard bolt and nut that was previously installed
floor to the top of the frame.
frame side-to-side so that the distance is equal on both sides.
assembly using a 3/4” bolt (HH). Place the bolt through one flat
washer (II), through the flange, a 1/2” wide spacer (Z), the hyme
joint, another 1/2” wide spacer (Z), the other flange, one flat washer
(II) and one nylock nut (JJ). Tighten securely.
the travel of the suspension. Tighten the jam nut securely (Figure
4).
on the driver-side bracket in step one.
Technical Support
1-800-248-0892
Ext. 2
3
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