BDS 6-Inch Lift Kit — Dodge Ram 2500 / Ram 3500 SKU: BDS266FS | Dodge Ram 2500 / Ram 3500 2003–2007 | 4WD | Diesel | 6" Front / 4" Rear | FOX 2.0 Performance Series | Leaf Springs Rear | 4-Inch Axle

A complete 6-inch suspension lift kit engineered for the 2003–2007 Dodge Ram 2500 and Ram 3500 diesel 4WD — configured for the 4-inch rear axle. Diesel-specific progressive rate Pro-Ride coil springs provide the 6-inch front lift. BDS-engineered new lower control arms are longer than stock to rotate the axle for proper alignment, paired with a relocation mounting bracket to flatten the upper control arm angle. Forged drop pitman arm and track bar bracket correct steering geometry. The rear uses progressive rate multi-leaf springs for a 4-inch rear lift with extended U-bolts. FOX 2.0 Performance Series shocks front and rear. Clears up to 36-inch tires.

Before ordering: This kit fits 2003–2007 Dodge Ram 2500 and Ram 3500 diesel 4WD. You must measure your rear axle tube diameter before ordering — this kit is configured for the 4-inch axle. Two axle diameters exist on this generation Ram and the wrong selection results in an incompatible rear kit. This kit is diesel-specific — gas engine models are not supported. If your truck's steering gear box has been replaced and the sector shaft diameter measures approximately 1-1/2 to 1-5/8 inches, you must add BDS082404 to your kit. Welding equipment, a cut-off tool, and a grinder/sanding disc are required specialty tools — confirm your installer has these before scheduling. If driveline vibration occurs after installation, transfer case drop kits are available separately (see Critical Compatibility).

Required separately (conditional):

• BDS082404 — Required if steering gear box has been replaced and sector shaft diameter is approximately 1-1/2 to 1-5/8 inches
• Transfer case drop kit (if driveline vibration occurs): 122602 (03–05 Diesel Auto), 122605 (06–08 Diesel Auto), or 122606 (03–13 Diesel Auto with OE mount PN 52121938AA). Auto transmission only. Alternatively, T-case index kits 122801 (auto) or 122802 (manual).

Verified Fitment

Diesel only. Gas engine models are not supported on any trim or year.

Component Specifications

Lift Configuration (this SKU):

Pro-Ride Coil Springs — Front:

Control Arms:

Rear Lift — Leaf Springs:

FOX 2.0 Performance Series Shocks (front and rear):

What Is and Is NOT Included

Included — Front:

• Diesel-specific progressive rate Pro-Ride coil springs (pair)
• BDS-engineered lower control arms (pair — longer than stock)
• Upper control arm relocation mounting brackets
• Forged drop pitman arm
• Track bar relocation bracket
• Sway bar links
• Bump stops
• FOX 2.0 Performance Series front shocks

Included — Rear:

• Multi-leaf progressive rate rear springs (4-inch, 4-inch axle configuration)
• Extended U-bolts
• FOX 2.0 Performance Series rear shocks

Not included (conditional — may be required):

• BDS082404 — Required if steering gear box has been replaced and sector shaft diameter is approximately 1-1/2 to 1-5/8 inches
• U-bolt 4068 — some 4-inch axle models with dual overloads may require this; confirm before ordering
• Transfer case drop kits (if driveline vibration occurs): 122602, 122605, or 122606 (auto transmission only); or T-case index kits 122801 (auto) / 122802 (manual)

Critical Compatibility

• Rear axle measurement required — 4-inch axle configuration: This kit is built for the 4-inch axle. Two rear axle diameters exist on this generation Ram. Measure your rear axle tube before ordering. The wrong axle selection results in an incompatible rear kit.
• 4-inch axle dual overload note: Some 4-inch axle models equipped with dual overloads will require U-bolt 4068. Confirm your rear axle configuration before ordering.
• Diesel only: Diesel-specific Pro-Ride coil springs are included. Gas engine models are not supported.
• Steering gear box sector shaft check: If the steering gear box on your truck has been replaced and the sector shaft diameter measures approximately 1-1/2 to 1-5/8 inches, BDS082404 must be added. Inspect your sector shaft before ordering.
• Transfer case drop kits: Not included and not required for standard installation. If driveline vibration occurs after installation, transfer case drop kits are available: 122602 (03–05 Diesel Auto), 122605 (06–08 Diesel Auto), or 122606 (03–13 Diesel Auto with OE mount PN 52121938AA). Auto transmission only. T-case index kits 122801 (auto) or 122802 (manual) are also available.
• 6.7L Diesel and dual rear shock kit: If also installing dual rear shock kit 122009, exhaust modification is required on 6.7L diesel models for that specific accessory.
• Welding and grinding required: Grinder/sanding disc, cut-off tool, and welding equipment are listed as required specialty tools. Confirm installer capability before scheduling.
• ADAS recalibration: Required after installation at a qualified dealer or ADAS service center. All recalibration costs are the owner's responsibility.
• Tire fitment: Clears up to 36 x 12.50-inch tires. Minor trimming may be required.

Installation Notes

Professional installation is strongly recommended. This kit is rated Moderate with an estimated installation time of 6–8 hours. Specialty tools required: grinder/sanding disc, cut-off tool, pitman arm puller, and welding equipment. Confirm your installer has all required tools before scheduling.

Verify before beginning:

• Rear axle tube diameter confirmed as 4-inch
• Dual overload check (may require U-bolt 4068)
• Steering gear box replacement and sector shaft diameter check (if replaced, measure — if 1-1/2 to 1-5/8 inches, add BDS082404)
• Transmission and transfer case type (relevant to T-case drop kit selection if needed)
• Installer has welding equipment, cut-off tool, and grinder
• ADAS recalibration appointment scheduled

Professional alignment is required after installation. Refer to the current BDS Suspension installation instructions for SKU BDS266FS for complete procedures, torque specifications, and component-specific instructions.

The Obsidian Take

The BDS266FS is the 4-inch axle variant of the same 2003–2007 Dodge Ram 2500/3500 diesel 6-inch lift kit offered as BDS236FS (3-1/2 inch axle). Platform, components, front lift, rear lift height, shock option, and all installation requirements are identical — the axle-specific rear kit is the only substantive difference. Measure your rear axle tube before ordering. If your truck has the 4-inch axle and dual overloads, also confirm whether U-bolt 4068 is required. The sector shaft check on older trucks with steering gear box replacements is the other item to verify — BDS082404 is inexpensive but easy to miss until installation day.

This Product Is For You If

• You own a 2003–2007 Dodge Ram 2500 or Ram 3500 diesel 4WD with a confirmed 4-inch rear axle.
• Your truck's steering gear box is factory original, or if replaced, the sector shaft diameter is not in the 1-1/2 to 1-5/8 inch range (or you will add BDS082404).
• You want the leaf spring rear option for reduced axle wrap, improved stability, and maintained factory payload ratings.
• You want 6 inches of front lift and 4 inches of rear lift with FOX 2.0 Performance Series shocks.
• You want up to 36-inch tire clearance.
• Your installer has welding equipment, a cut-off tool, and a grinder.

This Product Is Not For You If

• You have not measured your rear axle tube diameter — wrong axle selection produces an incompatible kit.
• Your rear axle is a 3-1/2 inch axle — see SKU BDS236FS.
• Your truck has a replaced steering gear box with a sector shaft diameter of approximately 1-1/2 to 1-5/8 inches and you have not added BDS082404.
• Your Ram has a gas engine.
• Your Ram is 2WD.
• Your installer does not have welding equipment or a cut-off tool.
• You want the block rear option — see the block kit variant.
• You want NX2 Nitro Series shocks — see the NX2 variant.
• You want FOX 2.5 Performance Elite Series shocks — see the FOX 2.5 variant.

Product Family Reference

Common Questions

What is the difference between BDS266FS and BDS236FS?
The only difference is the rear axle configuration. BDS266FS is for trucks with a 4-inch rear axle. BDS236FS is for trucks with a 3-1/2 inch rear axle. All other components, lift heights, shock options, and installation requirements are identical. Measure your rear axle tube before ordering.

Why do I need to measure my rear axle before ordering?
Two different rear axle tube diameters exist on this generation Ram. Ordering the wrong axle configuration produces an incompatible rear kit. Measure your rear axle tube with a tape measure before placing your order.

I have a 4-inch axle with dual overloads — do I need a different U-bolt?
Some 4-inch axle models equipped with dual overloads require U-bolt 4068. Inspect your rear axle and spring configuration and confirm with BDS or your installer before ordering.

What is the sector shaft check and why does it matter?
If the steering gear box on your truck has been replaced, the replacement unit may have a different sector shaft diameter. If the sector shaft measures approximately 1-1/2 to 1-5/8 inches, BDS082404 is required. Inspect your sector shaft before ordering.

What if I have driveline vibration after installation?
Transfer case drop kits are available separately: 122602 (03–05 Diesel Auto), 122605 (06–08 Diesel Auto), 122606 (03–13 Diesel Auto with OE mount PN 52121938AA). All automatic transmission only. T-case index kits 122801 (auto) or 122802 (manual) are also available.

Does this kit fit the gas Ram?
No. The Pro-Ride coil springs are diesel-specific. Gas engine models are not supported.

Does ADAS need to be recalibrated after installation?
Yes. This kit changes vehicle ride height and suspension geometry. All ADAS sensors require professional recalibration. All recalibration costs are the owner's responsibility.

Manufacturer Data Disclaimer

Fitment, specification, included-component, and installation data for this kit are sourced from BDS Suspension manufacturer documentation and OFAS-verified product data current as of publication. Manufacturer specifications and included components are subject to change without notice; confirm current documentation for this SKU at the time of purchase.

Required Legal, Warning, Fitment, and Return Notices

ADAS Recalibration Warning: This kit alters vehicle ride height and suspension geometry. All advanced driver assistance system (ADAS) sensors require professional recalibration after installation. Schedule recalibration at an authorized dealer or certified ADAS service center. All recalibration costs are the owner's responsibility.

Installation Warning: Professional installation is strongly recommended. Welding equipment, a cut-off tool, and a grinder/sanding disc are required specialty tools. Confirm installer capability before scheduling. A professional wheel alignment is required after installation.

Rear Axle Warning: Two rear axle tube diameters exist on this generation Ram. Measure your rear axle tube before ordering. Ordering the wrong axle configuration produces an incompatible rear kit.

Steering Gear Box Warning: If the steering gear box has been replaced and the sector shaft diameter measures approximately 1-1/2 to 1-5/8 inches, BDS082404 must be added to this kit. Inspect your sector shaft before ordering.

Tire Fitment Notice: Up to 36 x 12.50-inch tires are supported. Trimming may be required. Buyer is responsible for verifying tire and wheel clearance for their specific vehicle and build.

California Proposition 65 Warning: This product can expose you to chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

Return Policy: All returns require prior authorization from Obsidian Forged Auto Supply — do not ship any product back without a Return Merchandise Authorization (RMA). To request an RMA, contact OFAS at Support@obsidianforgedautosupply.com or 469-407-7538 (Monday–Friday 9am–5pm CST, Saturday 9am–3pm CST) with your order number, product SKU, return reason, and photos. Return requests must be submitted within 90 days of delivery. To qualify, the product must be new, unused, uninstalled, complete with all hardware and included components, and in original manufacturer packaging. Do not write on, tape to, or place shipping labels directly on the manufacturer's product box. Return shipping is the customer's responsibility in all cases. Non-defective returns may be subject to a 15% restocking fee. No restocking fee applies when OFAS shipped the wrong item or the return is due to a verified defect or approved damage claim. Some products — including special-order, electrical, and installed items — may be non-returnable. Return eligibility is also subject to applicable manufacturer and supplier return requirements. Approved refunds are issued to the original payment method within approximately 10 business days of the warehouse receiving and processing the returned product. For damaged, missing, or incorrect shipments, contact OFAS within 48 hours of delivery, retain all packaging, and do not install the product.