Rough Country 478.20 - Manual

08-10 F250 4.5” SUSPENSION KIT
92147800
Tools Needed:
8mm Wrench 1 1/8” Wrench
10mm Wrench 1 13/16” Wrench
12mm Wrench Jack Stands
15mm Wrench Jack
17mm Wrench
Drill
17mm Socket Drill Bits-13/16-7/8
18mm Wrench
18mm Socket
19mm Wrench
21mm Wrench
24mm Socket
30mm Socket
Thank you for choosing Rough Country for your suspension needs.
Rough Country recommends a certified technician installs 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 all the instructions before beginning the installation. Check the kit hardware against the parts list. Be sure
you have all the needed parts and understand where they go. Also please review the 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. We strongly recommend seat belts and shoulder
harnesses should be worn at all times. Avoid situations where a side rollover may occur.
Braking performance and capabilities are decreased when significantly larger/heaver tires and wheels are used. Take
this into consideration while driving. Also, speedometer recalibration is necessary when larger tires are installed.
Do no add, alter, or fabricate any factory or after-market parts which increase vehicle height over the intended height of
the Rough Country product purchased. Mixing component brands, lifts, and/or combining body lift with suspension lifts
voids all warranties. 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 kit is packaged as a leveling kit—raising the front 4.5” and the back 3”. 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 block / u-bolt options.
This 4.5” suspension system was developed for 35x12.50x17 tire on an after market wheel w/ 4.5” back spacing.
If equipped with factory rear contact overload springs, please note that they will need to be removed with the
addition of the block / or add-a-leaf combination on this kit.
NOTICE TO DEALER AND VECHICLE OWNER
Any vehicle equipped with any Rough country product must have the “Warning to Driver” decal installed on the sun visor
or dash. The decal is to act as a constant reminder for whoever is operating the vehicle of its unique handling character-
istics. INSTALLING DEALER—It is your responsibility to install the warning decal and to forward these installation in-
structions on too the vehicle owner for review and to be kept in the vehicle for its service life.
Kit Contents:
Coil Springs
Gas Coil Springs
1594Box1 Track Bar Bracket
Radius arm Drop Brkts
Sway Bar links
Pass Sway Bar Bracket
Driver Shim Plate
Carrier Drop Bracket
Pitman Arm
Bumpstop spacer
Dr & Pass Brake Lines
1580Box4 Shock Box
6578 3” Block and U-Bolt 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 55ft/lbs 75ft/lbs
14MM 85ft/lbs 120ft/lbs
16MM 130ft/lbs 165ft/lbs
18MM 170ft/lbs 240ft/lbs