6" 2019-2022 Ford F450/F550 4WD Dirt Logic 4.0 Coilover Radius Arm Lift Kit by Fabtech

Heavy-duty height with daily-drive manners. Built specifically for the Ford F-450/F-550 4WD Diesel, Fabtech’s K2336DL 6-inch Radius Arm System is a serious upgrade over stock—engineered to add strength, correct steering geometry, and deliver controlled wheel travel for work, towing, and off-road use. The package centers on Fabtech’s legendary tubular Radius Arms and massive Dirt Logic 4.0 remote-reservoir coilovers up front, matched with tuned rear lift components that preserve load capacity and ride quality.

Results you can feel: a centered front axle, confident on-road tracking, full-lock steering with 12.50-inch wide tires on 5" backspacing wheels, and composed damping whether you’re crawling a site road or cruising the interstate.

How It Works

• Fabtech Tubular Radius Arms add rigidity and correct caster for stable, precise steering at lift height—now with a redesigned side plate and bold laser-cut branding.
• Dirt Logic 4.0 Resi Coilover Conversion (Front) bolts into the factory coil buckets using stout 1/4" steel brackets, delivering big-bore control and added front wheel travel.
• Track Bar Relocation + Dropped Pitman Arm re-align the steering and track bar planes to center the axle and reduce bump steer.
• Rear Lift Blocks with Integrated Bump Stops achieve height without compromising ride or payload; matched Dirt Logic 2.25 rear shocks refine control.

Features & Benefits

• Fabtech Radius Arms: redesigned tubular construction for superior strength; offset design maintains full turning radius with 12.50-wide tires on 5" backspacing wheels; alignment cams provide up to +1.5° caster adjustment.
• Dirt Logic 4.0 Coilovers (Front): 4" stainless-steel bodies with 1.25" NitroSteel® piston rods for durability; remote aluminum reservoirs manage heat for consistent damping under heavy loads and high-speed chatter.
• Track Bar Relocation Bracket: 1/4" thick, boxed steel to center the axle and minimize deflection through the full suspension cycle.
• Dropped Pitman Arm: forged, high-strength piece tuned to work with the factory drag link and Fabtech track-bar geometry.
• Sway Bar, Bump Stop & Brake Line Brackets: 1/4" steel drop/extension brackets correct component angles, prevent over-travel, and retain the factory hydraulic system—no line opening required.
• Steering Stabilizer Retention: heavy-duty bracket and support brace keep the OEM stabilizer in place to help reduce shimmy.
• Rear System: lift blocks and U-bolts raise the rear while maintaining ride quality and load-carrying capability; matched Dirt Logic 2.25 shocks finish the package.
• Engineered Convenience: bolt-on design with application-specific hardware and detailed instructions.

What’s Included

• Pair of Fabtech tubular Radius Arms with alignment cams
• Dirt Logic 4.0 front remote-reservoir coilovers + 1/4" steel conversion brackets
• Track Bar Relocation Bracket (boxed 1/4" steel)
• Dropped Pitman Arm
• Sway Bar Drop Brackets
• Front & Rear Bump Stop Brackets
• Brake Line Relocation Brackets
• Steering Stabilizer Retention Brackets
• Rear Lift Blocks with integrated bump stops & U-bolt kit
• Pair of Dirt Logic 2.25 rear shocks
• All required installation hardware & instructions

Tire and Wheel Options:

• Tire Size – 38/12.50R17 Wheel Size – 17×9 w/ 4 3/4in BS w/minor trimming
• Tire Size – 38/12.50R18 Wheel Size – 18×9 w/ 4 3/4in BS w/minor trimming
• Tire Size – 38/12.50R20 Wheel Size – 20×9 w/ 5in BS w/minor trimming
• Tire Size – 40/12.50R17 Wheel Size – 17×9 w/ 4 3/4in BS w/cutting
• Tire Size – 40/12.50R18 Wheel Size – 18×9 w/ 4 3/4in BS w/cutting
• Tire Size – 40/12.50R20 Wheel Size – 20×9 w/ 5in BS w/cutting