6 Inch Lift Kit w/ Radius Arm | Ram 3500 w/ Rear Air Ride (13-18) 4WD | Diesel

Built for Ram 3500 diesel owners who demand 6 inches of lift without compromising their truck's geometry. This BDS radius arm kit lifts your 3500 while preserving factory caster and pinion angle — no awkward steering feel, no accelerated wear. You get a complete front suspension overhaul with coilover springs, new control arms, and adjustable track bar geometry correction so your truck handles like it was engineered this way from the factory.

Installed and serviced at Road Runner Wheels & Tires. Most kits go in the same day. Call (678) 400-6467 to schedule.

What you get up front

• Coilover springs — engineered for 6-inch lift height while maintaining ride quality and load capacity under diesel engine weight.
• Radius arms — factory-style geometry correction that keeps caster and pinion angle dialed in, eliminating bump-steer and odd steering behavior.
• Adjustable track bar — compensates for suspension geometry changes and keeps your axle centered under the frame.
• New front control arms — heavy-duty design rated for 3500 diesel payload and towing loads.

Out back

Your factory rear air suspension stays in place. BDS coordinates lift geometry so the rear air springs don't max out prematurely — you get the full 6-inch lift benefit end-to-end without stranding yourself on the highway.

Pick your shocks

• BDS NX2 Nitro Series — comfort-tuned damping for daily driving and light off-road work. Excellent value, professional install included.
• FOX 2.0 Performance Series — rebuildable monotube design with speed-sensitive damping. Built for rocky terrain and high-speed desert runs without fade.

Important notes

• This kit is engineered for 2013–2018 Ram 3500 4WD models equipped with factory rear air suspension. Confirm your model year and driveline before ordering.
• Maximum tire clearance supports up to 37-inch tires with proper backspacing — verify offset and width with your wheel choice to avoid rubbing at full suspension travel.
• Factory air suspension must be in good working order at installation. If your rear air springs or compressor are failing, address those first.
• BDS radius arm geometry is calibrated for stock or near-stock driveshaft angle — aftermarket driveshaft modifications may require re-indexing.

Why customers pick this at Road Runner

• Local BDS warranty support — we handle warranty claims and service right here, no mail-in hassles.
• Diesel-specific install expertise — our techs work on 6.7L Cummins trucks every week and know the gotchas (transfer case clearance, factory brackets, etc.).
• Professional install in our shop — most 3500 kits are done before you pick it up, so you're not renting a car all week.
• Radius arm geometry done right — we set caster, pinion angle, and track bar preload correctly so your truck steers true and doesn't eat tires.

Ready to build it? Call (678) 400-6467. Hablamos Español.