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

Built for diesel Ram 3500 owners who need serious tire clearance without sacrificing drivability. This 4-inch radius arm lift kit from BDS Suspension raises your 2013–2018 air-ride-equipped 3500 into genuine 37-inch tire territory while correcting steering geometry and preserving factory suspension angles. You get diesel-tuned coil springs, adjustable radius arms, and your choice of two proven shock options — all installed and serviced locally.

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

• Pro-Ride Coil Springs — Full-length, diesel-specific progressive-rate springs engineered for 4 inches of lift while keeping the ride predictable over uneven terrain.
• Heavy-Duty Tubular Radius Arms — Factory-location mount with integrated caster adjustment so you dial in the right geometry for your lift height. Rubber bushings keep it quiet and maintenance-free.
• Forged Drop Pitman Arm & Track Bar Bracket — Steering correction hardware that minimizes angle change and keeps the front axle centered as you articulate, preserving OE handling.
• Bump Stops & Brake Line Brackets — All the small hardware you need for a complete, safe installation.

Out back

A high-strength fabricated lift block, heavy-duty air bag spacer, and longer u-bolts raise the rear 3 inches and level the stance. You get a matching set of shocks below.

Pick your shocks

• BDS NX2 Nitro Series — Nitrogen-charged comfort for daily driving. Handles highway and light off-road without breaking the bank.
• FOX 2.0 Performance Series — Adjustable DSC (Dual Speed Compression) tuning for trucks that see serious terrain. Fine-tune comfort and control on the fly.

Important notes

• Maximum tire size is 37 x 12.5 inches. Larger tires will rub and void warranty.
• This kit is designed for factory rear air-ride systems only. Verify your truck has factory air suspension before ordering.
• Factory stamped-steel radius arms are replaced — the kit does not work with OEM arms.
• Caster adjustment is built into the radius arm design; verify final caster specs with your installer after lift is complete.

Why customers pick this at Road Runner

• BDS kits corrected and tested for Ram diesel geometry — we install these every week and know exactly what works.
• Radius arm design preserves steering response and front axle centering, so your truck handles like it's supposed to.
• Full BDS warranty backed by a local dealer — no warranty hassles, no shipping parts back and forth.
• . We've got the parts, the lift bay, and the techs ready.
• We stock both shock tiers, so you pick comfort or performance and we build it right here.

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