Zone Offroad D139F 4-Inch Radius Arm Lift Kit with FOX 2.0 Adventure Series Shocks

The Zone Offroad D139F is a complete 4-inch radius arm suspension lift kit engineered for 2013–2018 Ram 3500 4WD gas-powered trucks. This all-inclusive system delivers improved ride quality, corrected suspension geometry, and the stance and clearance needed for larger tires—both on the road and off it.

Up front, the kit replaces the factory stamped steel radius arms with heavy-duty 1/4" boxed, internally gusseted steel radius arms to correct caster, maximize ground clearance, and add long-term durability. Progressive rate front coil springs improve ride comfort across all terrain types. A forged pitman arm and track bar relocation bracket recenters the front axle and corrects steering angles after the lift. Extended bump stops, sway bar relocation hardware, and brake line relocation brackets maintain factory-like operating angles throughout the suspension travel.

In the rear, the kit includes 2-inch fabricated lift blocks and longer U-bolts to level the stance and retain ride quality. Premium FOX 2.0 Adventure Series IFP monotube shocks are included at all four corners, delivering superior damping performance over the factory units for both daily driving and off-road use.

Key Features:

• 4 inches of front lift via full-length progressive rate coil springs
• Heavy-duty 1/4" boxed and internally gusseted steel replacement radius arms
• Caster correction built into radius arm design for proper alignment after lift
• Forged pitman arm and HD track bar relocation bracket to recenter the front axle
• FOX 2.0 Adventure Series IFP gas shocks front and rear
• 2-inch rear lift blocks with extended U-bolts to level the stance
• Extended bump stops, sway bar relocation, and brake line brackets included
• Clearance for up to 37-inch tires
• Backed by Zone Offroad's Factory Protection Plus warranty

The D139F kit includes all necessary hardware for a complete installation, making it a straightforward upgrade for Ram 3500 owners looking to add aggressive stance, improved off-road capability, and upgraded shock performance in a single package.