Rear lift provided by multi-leaf progressive rate leaf springs that maintain factory payload weight ratings and reduce axle wrap for a more controlled and stable feel. Configured for a 4 inch rear axle. Includes NX2 Nitro Series shocks featuring nitrogen-charged twin-tube design, 10-stage velocity-sensitive valving, dual-welded ends, 1-3/8-inch high-flow piston, self-lubricating seals, and silver powder coat finish.
Overview
BDS Suspension engineered this 6-inch lift kit with long arm conversion for the 2003–2007 Dodge Ram 2500 and 3500 4WD diesel truck. Designed to improve stance, performance, and capability, the kit provides clearance for up to 37-inch tires. The long lower control arms reduce caster change through wheel travel for more controlled steering feel, while the system retains the factory triangulation of the arms to add stability to the suspension system.
Up front, the kit includes diesel-specific Pro-Ride coil springs, all four control arms with mounting brackets, a forged drop pitman arm, track bar bracket for steering correction, bump stops, sway bar links, and nitrogen-charged shocks. In the rear, the kit includes heavy duty cast steel blocks or leaf springs (by variant), longer u-bolts, and a matching set of shocks.
Pro-Ride Coil Springs
A pair of full-length, diesel-specific, progressive rate Pro-Ride coil springs provide the correct lift height and a smooth, predictable ride across various terrains. Manufactured from high tensile steel with a properly sized wire diameter, these direct OE replacement coil springs are engineered for maximum reliability without premature coil bind.
Steering Correction
A forged drop pitman arm minimizes steering angle once lifted, paired with a heavy duty track bar drop bracket that keeps steering geometry in phase through suspension travel while recentering the front axle.
Features
- Tubular long arms reduce caster change and create more controlled feel on and off road
- Heavy duty control arm brackets maintain proper suspension geometry
- Front high-strength progressive rate Pro-Ride coil springs for smooth ride on any terrain
- Front track bar relocation bracket to re-position axle
- Forged drop pitman arm to correct steering angles
- Front sway bar correction to maintain handling performance
- Compatible with NX2 Nitro Series or FOX 2.0 Performance Series shocks (by variant)
- Provides clearance for up to 37-inch tires
Specifications
- Lift Height: 6 inches
- Vehicle Fitment: 2003–2007 Dodge Ram 2500/3500 4WD Diesel
- Rear Lift Options: Cast iron block kit (tapered for correct pinion angle, offset pin/hole to restore axle position) or multi-leaf progressive rate leaf springs (maintains factory payload weight ratings, reduces axle wrap)
- Rear Axle Options: 3-1/2 inch or 4 inch axle diameter
- Shock Options: NX2 Nitro Series or FOX 2.0 Performance Series (by variant)
- Front coil springs: High tensile steel, diesel-specific, progressive rate
- Rear blocks: Cast iron, tapered for pinion angle correction
- Rear u-bolts: Heavy duty, extended length
Installation
- Estimated Time: 6–8 hours
- Difficulty: Moderate
- Tools Required: Step Drill Bit, Drill / Bit Set, Pitman Arm Puller, Welding Equipment
Important Notes
- Measure rear axle tube before ordering. Some 4-inch axle models with dual overloads will require u-bolt 4068.
- Although unusual, if driveline vibration occurs, order the appropriate transfer case drop kit: 122602 (03–05 Diesel Auto), 122605 (06–08 Diesel Auto), or 122606 (03–13 Diesel Auto with OE mount P/N 52121938AA) — available in options — or t-case index kit #122801 (auto) or #122802 (manual transmission). Optional transfer case drop kits fit automatic transmission models only.
- Exhaust modification will be required for dual rear shock kit 122009 on 6.7L Diesel models.
- If your truck has had the steering gear box changed and the sector shaft diameter measures approximately 1-1/2"–1-5/8", you will need to add part # BDS082404 to your kit.
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