Rough Country 288.20 User Manual
921269N200
07 & UP 4WD GM 1500 3.5” FRT
Thank you for choosing Rough Country for your suspension needs.
Rough Country recommends a certified technician install this system. In addition to these instructions, professional knowledge of disassemble/reassembly procedures as well as post installation checks must be known. Attempts to install this system without this knowledge and expertise may jeopardize the integrity and/or operating safety of the vehicle.
Please read instructions before beginning installation. Check the kit hardware against the parts list on the rear cover of
these instructions. Be sure you have all needed parts and know where they go. Also please review tools needed list and
make sure you have needed tools.
PRODUCT USE INFORMATION
As a general rule, the taller a vehicle is, the easier it will roll. Seat belts and shoulder harnesses should be worn at all times.
Avoid situations where a side rollover may occur.
Generally, braking performance and capability are decreased when larger/heavier tires and wheels are used. Take this into
consideration while driving. Do not add, alter, or fabricate any factory or after-market parts to increase vehicle height over
the intended height of the Rough Country product purchased. Mixing component brands is not recommended.
Rough Country makes no claims regarding lifting devices and excludes any and all implied claims. We will not be responsible for any product that is altered.
If question exist we will be happy to answer any questions concerning the design, func-
tion, and correct use of our products.
This kit will not fit vehicles equipped with electric steering.
This kit is packaged as a leveling kit—raising the front 3.5” and the back 1.75”. If you desire a different look or if the vehicle
has a tool box or added weight in the rear, please consult with your sales representative about other block and u-bolt options.
This suspension system was developed using a 32 x 11.5 tire with factory wheels. Examples of the tire sizes can be used
are 285/75R17, 285/65R18, or 285/55R20. Note if wider tires are used, offset wheels will be required and trimming may be
required.
NOTICE TO DEALER AND VEHICLE OWNER
Any vehicle equipped with any Rough Country product should have a “Warning to Driver” decal installed on the inside of the
windshield or on the vehicle’s dash. The decal should act as a constant reminder for whoever is operating the vehicle of its
1.75” REAR LIFT KIT
Tools Needed:
18MM Wrench
17MM Wrench
15MM Wrench
21MM Wrench
11MM Wrench
10MM Wrench
10MM Allen Wrench
Floor Jack
Jack stands
Drill
1/2” drill bit
Thread Locker
Torque Specs:
Size Grade 5 Grade 8
5/16” 15 ft/lbs 20 ft/lbs
3/8” 30 ft/lbs 35 ft/lbs
7/16” 45 ft/lbs 60 ft/lbs
1/2” 65 ft/lbs 90 ft/lbs
9/16” 95 ft/lbs 130 ft/lbs
5/8” 135 ft/lbs 175 ft/lbs
3/4” 185 ft/lbs 280 ft/lbs
Class 8.8 Class 10.9
6MM 5 ft/lbs 9 ft/lbs
8MM 18ft/lbs 23 ft/lbs
10MM 32ft/lbs 45ft/lbs
12MM 55ft/lbs 75ft/lbs
14MM 85ft/lbs 120ft/lbs
16MM 130ft/lbs 165ft/lbs
18MM 170ft/lbs 240ft/lbs
FRONT INSTALLATION
1. Park the vehicle on a level surface and chock the rear wheels.
2. Jack up the front of the vehicle. Place jack stands under the frame rails and lower onto jack stands letting the front suspension hang.
3. Remove the tires and wheels. Remove the upper and lower factory skid plates using a 15mm wrench. Retain factory
hardware and front skid plate for reuse.
4. Using a 21mm wrench, remove the tie-rod nut as shown in Photo 1. Strike the side of the mount to dislodge the tie rod
end. Remove from the knuckle.
5. Remove and unplug the ABS sensor wire from the frame as shown in Photo 2.
Photo 1 Photo 2
Strike here to dislodge tie rod end
6. Remove the upper ball joint nut using a 18mm wrench. See Photo 3. Strike the knuckle as shown to dislodge the ball
joint. Separate the upper control arm from the knuckle.
7. Using a 18mm wrench, remove the upper strut nuts as shown in Photo 4. Retain factory hardware for reuse.
Photo 3
8. Using a 15mm wrench, remove the 2 bolts securing the lower strut mount to the lower control arm and remove the strut
from the vehicle. Remove and discard the factory lower retainer clips. New hardware will be used. See Photo 5.
Photo 5
Photo 4
9. Mark location of alignment cams on upper control arms to allow for reinstallation. Using a 21mm wrench and 21mm
socket, remove the upper control arms from the vehicle. See Photo 6. Retain the hardware for reuse
10. Using a 11mm wrench, remove the drive shaft bolts. See Photo 7. Retain hardware for reuse.
Photo 6 Photo 7
11. Place a floor jack under the differential assembly to provide
support for following steps.
12. Using a 15mm wrench, remove the 6 axle shaft bolts and se-
cure axle shafts out of the way. See Photo 8. Repeat on opposite side. Retain the factory hardware for reuse. Unplug the
electrical connector on differential as shown in Photo 9 and
unplug the diff vent hose. Photo 10.
13. Using a 18mm socket remove the 4 differential bolts (2 each
side) securing the differential to the frame. See Photo 8.
14. Slowly lower differential assembly to the ground.
15. Using a hand grinder. Grind away marked portion of the cool-
ing fin as shown in Photo 11 and Photo 12. Grind until flush
with casing.
Photo 9
Electrical Plug
DIFF BOLT
Photo 8
CV SHAFT BOLT
Photo 10
Photo 11
Diff Vent Hose
Photo 12
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