Rough Country 637 User Manual
92165600 REV1
JEEP JK 2 1/2” SUSPENSION KIT
Thank you for choosing Rough Country for all 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 kit content list on this page and
the kit layout on the back page. 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. 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.
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.
This system was developed to provide a level stance to the Jeep after it is lifted. You will note that the front lift is 2.5”
and the rear lift is 2”. This is intentional and is the look most often requested. Also you will note that this lift does not
modify the front or rear track bar or its mounting points. This will result in what is generally considered an insignificant
shift in both the front and rear axle of approx 1/4 of an inch. Rough Country offers an optional rear track bar bracket to
address this. Please call your nearest Rough Country dealer to inquire.
This suspension system was developed using a 285/75R17” tire with factory whe els. If bigger/wider tire are used with the
factory wheels or factory offset wheels you must carefully check the clearance during turning between the tires and the
lower control arm and the front sway bar link before driving. If you have any questions concerning the design, function,
and correct use of our products contact us at 800-222-7023.
IMPORTANT NOTES : The draglink must be adjusted to the center steering wheel BEFORE the vehicle is driven.
Failure to do so will cause a computer error in the Jeep’s traction control system.
On Automatic equipped vehicles; due to use of an oversize driveshaft from the factory and inadequate
factory clearance it may be possible for the front driveshaft to come in to contact with the automatic transmission pan tearing the factory boot and rubbing on the shaft. Generally this occurs during heavy articulation when
front sway bar links are disconnected and longer shocks are installed. If this is found to occur, the proper procedure would be to replace the oversize factory shaft with an aftermarket smaller diameter shaft to increase
clearance between the transmission and front driveshaft. Rough Country does offer this driveshaft if needed.
Kit Contents:
2— Front Coil Spring Spacers
2— Front Brake Line Brkts
2— Rear Coil Spring Spacers
2— Front Shock Extension
2— Rear Shock Extension
2—Rr Brake Line Ext Brkts
1--Poly Bag Containing:
2-.1/2” X 2 3/4” Bolts
2-1/2” lock washers
4-10mm x 80mm Bolts
4-10mm flat washers
2-Rear spacer retainers
2-12mm nuts
2-12mm x 65mm bolt
2-washers
2-5/16 x 3/4” bolt
2-5/16” nuts
4-5/16” washers
4-1/4” x 1” Bolts
4-1/4” Lock Nuts
8-1/4” Flat washers
Rear Spacer Retainers (2)
Front Brake Line Brkts
Rear Brake Line Brkts
Rear Shock
Extender
Bracket (2)
Rear Coil Spacer (2)
Front Coil Spacer (2)
Front Shock Bracket(2)
Tools Needed:
10mm Wrench
14mm Socket
16mm Wrench
16mm Socket
18mm Wrench
18mm Socket
19mm Deep Well Socket
Jack
Jack Stands
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 INSTRUCTIONS
1. Chock the rear wheels and jack up the front of the vehicle and support the vehicle with jack stands so that the front
wheels are off the ground.
2. Using a 19mm deep well socket remove the front tires/wheels,
3. Using a 18mm socket and wrench remove the bottom sway bar bolts. Retain hardware for later use. See Photo 1
4. Using a 18mm socket and wrench remove the lower shock bolt. See Photo 2. Retain the lower hardware for reuse.
Photo 1 Photo 2
5. Using a 10MM socket, remove the brake line bracket from
the stock location.
Photo 3
6. Push down on the axle to allow room for the coils to be removed. Remove coil springs, and factory spring isolator.
7. Install the new spacer over the factory bump stop with the
factory isolator as shown See Photo 3.
8. Reinstall the factory coil spring. Be sure to rotate the spring
until the pigtail hits the stop. See Photo 4.
9. Install the brake line extension bracket with the stock hardware to the frame. Install the stock line to the bracket with the
supplied 1/4” x 1’ bolt, washers and nut. See Photo 5.
Photo 4
Photo 5
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