BDS 8 Inch Long Arm Lift Kit | Dodge Ram 2500/3500 Diesel (2003-2007) 4WD | Block Kit 3-1/2" Axle | NX2 Nitro Series | Automatic

Rear lift uses a cast iron block kit sized for 3-1/2-inch axle tubes. Blocks are tapered for correct pinion angle, with an offset steel pin and hole to restore axle position. Multi-leaf progressive design maintains factory payload ratings and reduces axle wrap. Paired with NX2 Nitro Series shocks featuring nitrogen-charged twin-tube design, 10-stage velocity-sensitive valving, 1-3/8-inch high-flow piston, dual-welded ends, and silver powder coat finish. Configured for automatic transmission.

Overview

BDS Suspension engineered this 8-inch lift kit with long arm conversion for 2003–2007 Dodge Ram 2500 and 3500 diesel-powered trucks. Designed to improve stance, performance, and capability, this kit provides clearance for up to 38-inch tires. The long lower control arms reduce caster change through wheel travel, creating a more controlled steering feel, while the long arm system retains the factory triangulation of the arms for added suspension stability.

Up front, the kit includes diesel-specific Pro-Ride coil springs, all four control arms plus mounting brackets, a forged drop pitman arm, a track bar bracket for steering correction, bump stops, sway bar links, and precision-tuned shocks. In the rear, the kit uses heavy duty cast steel blocks or leaf springs (depending on configuration), 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 are included to provide the correct lift height and smooth, predictable ride across various terrains. Manufactured from high tensile steel with 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, and pairs with a heavy duty track bar drop bracket to keep the steering geometry in phase through suspension travel while recentering the front axle.

Features

• Tubular long arms reduce caster change and create a 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
• 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
• Provides clearance for up to 38-inch tires
• Available with NX2 Nitro Series or FOX 2.0 Performance Series shocks
• Available with rear block kit or leaf spring rear lift option
• Compatible with 3-1/2-inch and 4-inch rear axle tubes

Specifications

• Lift Height: 8 inches
• System Type: Long arm conversion
• Vehicle Fitment: 2003–2007 Dodge Ram 2500/3500 4WD Diesel
• Transmission: Available for automatic and manual transmissions
• Pro-Ride coil springs: Full-length, diesel-specific, progressive rate, high tensile steel
• Rear block option: Cast iron construction, tapered for correct pinion angle, offset pin and hole to restore axle position, multi-leaf progressive design
• Rear leaf spring option: Multi-leaf progressive design, maintains factory payload weight ratings, reduces axle wrap
• NX2 Nitro Series shocks: Nitrogen-charged twin-tube design, 10-stage velocity-sensitive valving, 1-3/8-inch high-flow piston, dual-welded ends, self-lubricating seals, silver powder coat finish
• FOX 2.0 Performance Series shocks: Internal floating piston (IFP) monotube design, 2-inch impact-extruded aluminum body, CNC-machined 6061-T6 aluminum mounting ends, 5/8-inch hard chrome-plated heat-treated alloy steel shaft, race-developed high-flow piston, application-specific valving, clear anodized finish

Installation

• Estimated Time: 8 hours
• Difficulty: Moderate
• Tools Required: Cut Off Wheel or equivalent, Grinder/Sanding Disc, Pitman Arm Puller, Welding Equipment

Important Notes

• Measure rear axle tube before ordering. Some 4-inch axle models with dual overloads will require UBT4068.
• Rear lift options will not fit dually applications.
• If driveline vibration occurs, order either transfer case drop. NOTE: 122606 transfer case drop kit will only replace the OE bracket #52121938AA.
• Additional front driveline modification may be required.
• Exhaust modification will be required for dual rear shock kit 122009.
• 2500 Gas models will require modification to the front exhaust crossover pipe on the driver side for proper clearance when a transfer case indexing ring kit is installed.
• If your truck has had the steering gear box changed and the sector shaft diameter measures approximately 1-1/2" to 1-5/8", you will need to add part #BDS082404 to your kit.