Suspension and Components Suspension Tubes and Components

Rough Country

4 Inch Jeep Long Arm Upgrade Kit 07-18 Wrangler JK Rough Country

$1,749.95

SKU: R04C 78600U

In Stock
In Stock
Ships by Aug 9
Free Shipping over $100
Non-Returnable Item
INSTALL DIFFICULTY
DIY PRO SHOP

Moderate — 2–4 hours

Description

Part #: 78600U

Transform your 4in kit into a full-fledge long arm setup with Rough Country's 4in Long Arm Upgrade Kit. This incredible upgrade converts your Rough Country 4in standard or 4in X-series kit into an extremely capable 4-link Long Arm suspension design.This upgrade gives your Jeep incredible flex and unbelievable clearance at a fraction of the cost of buying an entirely new kit. The 4-link setup includes a full set of front and rear upper and lower adjustable control arms giving you full control to adjust the wheelbase and pinion angle.Each arm features Rough Country's adjustable flex joints with Clevite rubber bushings and is constructed out of durable heavy-wall DOM tubing for a long lifespan of flex and performance. All brackets are made of a thick 1/4in thick high tensile strength plate steel.Rough Country's 4in kit boasts an easier install process than most long arm kits, with no welding and no removal of the factory crossmember Required for installation. The kit also includes extended stainless steel brake lines and coil correction plates making it that much faster and easier to install. Includes a Lifetime Replacement Guarantee!Features:Incredible articulationNo welding RequiredTrue 4-link setup with new, longer travel armsPrevents binding and rear-steerCoil correction plates correct the rear coil spring angle by 10 degrees, allowing them to function more effecientlyGain unparalelled axle flex while keeping pinion angles optimizedX-Flex control arm features:Clevite brand OEM style rubber bushingsFlex joints are fully rebuildableFlex joints feature a massive 2.5 Inch diameter body and 1.25 inch threadFully greasableDetails:Sold As KitDoors 4 DoorDrive 2WD|4WDLift Height 4.0 inchMount Style Bolt OnThickness 0.25 inchFront Components Upper adjustable control arms with flex joints Lower adjustable control arms with flex jointsRear Components Upper adjustable control arms with flex joints

MIA's Description

The Rough Country 78600U is a 4-inch Long Arm Upgrade Kit for 2007-2018 Jeep Wrangler JK and Wrangler Unlimited models. It requires an existing 4-6 inch suspension lift, and upgraded front and rear driveshafts are recommended. This kit transforms an existing lift into a 4-link Long Arm setup for enhanced off-road capability and articulation.

Fitment

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Specifications

BrandRough Country
Part NumberR04C 78600U

Buy with Confidence

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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