Rough Country PERF677 User Manual
92PERF1678
JEEP JK 2 1/2” PROGRESSIVE COIL KIT W/
PERFORMANCE 2.2. SHOCK ABSORBERS
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 the necessary tools to install this kit.
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.
This system was developed to provide a level stance to the Jeep after it is lifted. Please 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 a very 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 Part
# 1166 to address this. Please call your nearest Rough Country dealer to inquire.
IMPORTANT NOTE : The draglink must be adjusted to center the steering wheel BEFORE the vehicle is driv en.
Failure to do so will cause a computer error in the Jeep’s traction control system.
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.
Kit Contents:
2– Front Progressive Coil Springs
2– Rear Progressive Coil Springs
2- Fr Performance 2.2 Shock Absorbers
2– Rr Performance 2.2 Shock Absorbers
1--Shock Bag
Tools Needed:
10mm Wrench
16mm Wrench
16mm Socket
18mm Wrench
18mm Socket
19mm Deep Well Socket
Jack
Jack Stands
Torque Specs:
Size Grade 5 Grade 8
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
Class 8.8 Class 10.9
8MM 18ft/lbs 23 ft/lbs
10MM 32ft/lbs 45ft/lbs
12MM 55ft/lbs 75ft/lbs
14MM 85ft/lbs 120ft/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. Push down on the axle to allow room for the coils to be removed. Remove coil springs, and factory spring isolato r.
6. Install the new coil spring in the stock location with the factory isolator as shown See Photo 3.
7. Install the new Rough Country Performance 2.2 shocks in the factory location with the factory bolt in the lower
shock mount and tighten using a 18mm socket and wrench. See Photo 4.
8. Reinstall the front tires/wheels and tighten to factory specifications.
9. Remove the jack stands and lower the vehicle to the ground. Install the sway bar links on the sway bar using
factory hardware using a 18mm wrench after the vehicle is on the ground. Do not install the sway bar link on
the sway bar until the sway bar is on the ground.
Photo 3 Photo 4
10. The draglink must be adjusted to center the steering wheel BEFORE
the vehicle is driven. Failure to do so will
cause a computer error with the Jeep’s traction control sy stem and will result in odd handling and poor performance.
REAR INSTALLATION INSTRUCTIONS
1. Chock front wheels and jack up the rear of the vehicle and support the vehicle with jack stands so that the rear
wheels are off the ground.
2. Remove the rear tires/wheels
, using a 19mm deep well socket.
3. Remove the upper shock bolt using a 16mm socket and wrench. Remove the lower sh ock bolt using a 18mm socket
and wrench and remove the factory shock. See Photo 5. Retain the lower shock hardware for reuse.
4. Using a 18mm socket and wrench remove the bottom sway bar bolts. Retain hardware for later use. See Photo 6.
Photo 5
Photo 6
5. Using a 10mm wrench remove the bolt holding the brake line to the frame. See Photo 7. Push down on the axle to
allow enough room for stock coil spring to be removed. Remove the stock coil sp ring and isolator.
6. Install the stock isolator on the top of the new coil spring. See Photo 8.
Photo 7 Photo 8
7. Install the new Rough Country coil spring in the factory coil mount as shown in Photo 9.
8. Install the rear Rough Country Performance 2.2 shock in the factory location using the factory hardware. Tighten the
upper mount using a 16mm wrench and a 18mm wrench for the lower.
9. Reinstall the rear tires/wheels and tighten to factory specifications. Lower the vehicle to the ground.
Photo 9
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