Rough-country 257.20 Manuel d'utilisateur

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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 knowl-
edge of disassemble/reassembly procedures as well as post installation checks must be known. Attempts to install this sys-
tem 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 responsi-
ble 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 does not fit vehicles equipped with electric power 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 op-
tions.
This suspension system was developed using a 32 x 11.5 tire with factory wheels. Examples of tire sizes that 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
unique handling characteristics.
Tools Needed:
18MM Wrench
15MM Wrench
21MM Wrench
11MM Wrench
10MM Wrench
Floor Jack
Jack stands
Thread Locker
921277N201
07 & UP 4WD GM 1500 3.5” FRT
1.75” REAR LIFT KIT
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 50ft/lbs 75ft/lbs
14MM 85ft/lbs 120ft/lbs
16MM 130ft/lbs 165ft/lbs
18MM 170ft/lbs 240ft/lbs
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Résumé du contenu

Page 1 - 1.75” REAR LIFT KIT

Thank you for choosing Rough Country for your suspension needs. Rough Country recommends a certified technician install this system. In addition to

Page 2

CAB INSTALLATION INSTRUCTIONS 1. Raise hood disconnect positive and negative battery cable from the battery using 10mm wrench. This is done to preve

Page 3 - Electrical Plug

10. Remove upper radiator hose and overflow hose from fan shroud as shown in Photo 7 & 8. 11. Disconnect air intake hose from air box using a Phil

Page 4

LOOSEN FRAME END OF STRAP 15. Disconnect the emergency brake cable at the connection on the frame below the drivers door by removing the front part of

Page 5

19. Lift only enough to place body puck on top of body mount. See Photo 19. Note: Passenger side front body mount bolt can be removed by lifting the b

Page 6

31. Find the tab on driver side body mount where the emergency brake cable runs beside it and bend it up flat with frame to gain slack for cable. See

Page 7

38. Install tow hooks so that they are upside down and install stock bolts. Tighten to 65ft-lbs using a 18mm wrench / socket. See Photo 31. 39. Insta

Page 8 - KIT CONTENT

1. Unplug the license plate light connector and if equipped the trailer wiring connector. See Photo 1 & 2. 2. Remove the 3 bolts from the driver

Page 9

5. Loosen the six bed bolts using 18mm socket but only remove one side at a time. See Photo 6, 7 & 8. 6. With jack stand or hydraulic jack and w

Page 10

8. With bumper still removed, use the supplied template to mark and drill the new holes in the frame. See Photo 13. 9. Drill the holes using a 1/2”

Page 11

PHOTO 19 INSTALL THE 14MM X 60MM BOLTS POST INSTALLATION INSTRUCTIONS 1. Check all fasteners for proper torque. Check to ensure for adequate cleara

Page 12

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 t

Page 13

REAR BUMPER DRILLING TEMPLATE

Page 14

10. Mark location of alignment cams on upper control arms to allow installation of new arm to same position. Using a 21mm wrench and 21mm socket, re

Page 15

17. On the Drivers side, locate and secure the new diff mount drop bracket to the stock location using the supplied 12mm x 45mm socket head bolts. Ti

Page 16

27. Install the strut spacer on the factory strut with factory hardware and using a 18mm wrench. See Photo 20. 28. Install the strut assembly in the

Page 17

REAR INSTALLATION 1. Chock the front wheels. 2. Place a floor jack under the differential and jack up the rear of the vehicle. 3. Place jack stand

Page 18

Box Kit 1-Driver Side Control Arm 1-Pass Side Control Arm 1-Driver Side Diff Bracket 1-Pass Side Diff Bracket 1-Diff Lower Skid Plate

Page 19

Thank you for choosing Rough Country for your suspension needs. KIT CONTENT Dr. upper Control arm Strut spacers Pass. Upper control arm Lower skid pl

Page 20

07-11 GM 4WD 1500 P/U 1 1/4” Body Lift Thank you for choosing Rough Country for all your suspension needs. Rough Country recommends a certified techn

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