BDS 6-Inch Lift Kit | FOX 2.0 Shocks | Leaf Springs + 4-Inch Axle Block | Ram 2500/3500 4WD Diesel 2003–2007 | SKU: 266FS

The BDS 266FS is a 6-inch lift kit with FOX 2.0 Performance Series shocks for the 2003–2007 Ram 2500 and Ram 3500 SRW 4WD diesel. Front lift is delivered via diesel-tuned coil springs and geometry-correct radius arm correction brackets. Rear lift is matched via replacement leaf springs and 4-inch axle blocks. The complete front-to-rear system is engineered for the 2003–2007 Ram HD diesel platform — diesel engine weight, diesel towing loads, diesel geometry requirements throughout.

Before ordering — confirm the axle block height for your configuration. There are two 6-inch kits for the 2003–2007 Ram 2500/3500 diesel: 266FS uses a 4-inch rear axle block and 236FS uses a 3.5-inch rear axle block. The correct axle block height depends on your cab style and configuration. Text (469) 407-7538 to confirm which axle block height is correct for your specific truck before ordering.

This kit has three additional hard fitment splits before it applies to your truck.

First — engine: the front coil springs in this kit are diesel-tuned. Ram 2500/3500 gas has different front suspension weight requirements — a different kit is required.

Second — year: the 2003–2007 Ram HD is a specific platform generation. The 2008 Ram 2500/3500 requires a different kit. The 2009–2013 platform requires 6673FS. The 2014 and newer platform requires 1660FS or 1660FPE.

Third — drivetrain: 4WD only. Ram 2500/3500 2WD is not compatible.

Text (469) 407-7538 to confirm axle block height, generation, and configuration before ordering.

Component Specifications

What Is and Is NOT Included

Critical Compatibility

Confirm axle block height before ordering — two kits exist for this platform.

Unsure which axle block height is correct or whether your Ram 3500 is SRW or DRW? Text (469) 407-7538 before ordering.

2003–2007 Ram HD Diesel 6-Inch Kit Variants

Text (469) 407-7538 to confirm which axle block height is correct for your cab style and configuration before ordering.

Ram HD Diesel Lift Kit Generation Reference

Tire Clearance

At 6 inches of lift on the 2003–2007 Ram 2500/3500 diesel platform, typical fitment runs 37–40-inch tires depending on wheel offset and backspacing. Confirm maximum tire diameter and wheel specifications with your wheel and tire supplier before ordering.

Installation Notes

Professional installation is required. A 6-inch lift with leaf spring replacement on a diesel platform requires a qualified suspension shop with experience on heavy-duty truck platforms. This is not a bolt-on leveling kit. Do not attempt DIY installation.

Full front-end alignment is mandatory after installation. Do not drive on public roads before alignment is completed. Running a lifted truck without post-installation alignment causes accelerated tire wear, steering pull, and handling instability at diesel platform weights.

Driveline inspection is mandatory at 6-inch lift. At 6 inches, inspect driveshaft angles and U-joint operating angles after installation. Driveshaft modification may be required depending on your specific truck's configuration — confirm with your installer before the job begins.

Rear axle block installation. 4-inch axle blocks must be installed per BDS specifications. Confirm U-bolt torque specs and axle centering after installation — improperly centered axle blocks cause driveline vibration and premature U-joint wear.

Torque all fasteners to BDS specification. Torque specs are included in the BDS installation instructions. Do not estimate torque values on a diesel-weight platform.

FOX shock break-in period. Allow FOX 2.0 shocks to complete the manufacturer-recommended break-in period before aggressive off-road or heavy towing use.

Text (469) 407-7538 to confirm axle block height and configuration before ordering.

The Obsidian Take

The BDS 266FS is the correct kit for the 2003–2007 Ram 2500 or Ram 3500 SRW 4WD diesel owner who wants 6 inches of front and matched rear lift with FOX 2.0 damping and a 4-inch rear axle block. Diesel-tuned springs front, replacement leaf springs and 4-inch axle blocks rear, geometry-correct radius arm brackets throughout — a complete front-to-rear system engineered for the diesel engine weight and towing demands of this specific platform generation.

The only decision between this kit and 236FS is the axle block height — 4 inches here versus 3.5 inches in 236FS. That half-inch difference affects rear ride height and geometry balance for your specific cab and configuration. Text (469) 407-7538 with your cab style and configuration before ordering — ordering the wrong axle block height is the most common misorder on this platform and the kit is non-returnable once installed.

If your Ram HD is a 2008, this kit does not apply. If it is a 2009–2013, order 6673FS. If it is a 2014 or newer, order 1660FS or 1660FPE. If it is a 2003–2007 diesel SRW 4WD with the 4-inch axle block confirmed — the 266FS is the complete, platform-correct solution.

Common Questions

What is the difference between 266FS and 236FS?
Both kits fit the 2003–2007 Ram 2500/3500 SRW 4WD diesel and deliver 6 inches of front lift. The only difference is the rear axle block height — 266FS uses a 4-inch block and 236FS uses a 3.5-inch block. The correct block height depends on your cab style and configuration. Text (469) 407-7538 to confirm which is correct before ordering.

Why does it matter if my Ram is gas or diesel for a lift kit?
The diesel engine is significantly heavier than the gas engine. Front coil springs are tuned for a specific front axle weight — diesel-tuned springs under a gas engine result in excessive spring rate and harsh ride. Gas springs under a diesel engine result in sag, incorrect ride height, and compromised geometry. The correct spring tune for your engine is not interchangeable.

What is the driveline inspection for and can I skip it?
At 6 inches of lift, driveshaft angles change significantly from factory. U-joints operating outside their designed angle range wear rapidly and can fail under towing load. The inspection confirms whether your driveshaft requires modification. On a diesel towing platform at 6-inch lift, this is not optional.

Does this fit the Ram 3500 Dually?
Ram 3500 DRW compatibility is not confirmed for this kit. Text (469) 407-7538 before ordering if your Ram 3500 is a Dually configuration.

What tire size fits at 6-inch lift?
Typical fitment on the 2003–2007 Ram 2500/3500 diesel at 6-inch lift runs 37–40-inch tires depending on wheel offset and backspacing. Confirm maximum tire diameter and wheel specs with your wheel and tire supplier before ordering.

What warranty does this kit carry?
BDS suspension components carry the BDS No-Fine-Print Warranty. FOX 2.0 shocks carry a FOX 1-year limited warranty.

Verified Fitment