BDS 6-Inch Radius Arm Lift Kit | FOX 2.5 Performance Elite | Ram 2500 4WD Diesel 2019–2026 | SKU: 1680FPE

Verified Fitment

Component Specifications

What Is and Is NOT Included

Critical Compatibility

Gas vs. diesel is a hard fitment split on this platform. Diesel-tuned coil springs are engineered for the significantly heavier front-end weight of the Cummins diesel engine. Installing gas-tuned springs under a diesel results in sag, incorrect ride height, and compromised geometry. Installing diesel-tuned springs under a gas engine results in excessive spring rate and harsh ride. Confirm your engine before ordering. Contact OFAS at (469) 407-7538 if you have any doubt.

2019–2026 Ram 2500 Diesel 6-Inch Kit Shock Tier Reference

Both kits deliver the same 6 inches of front lift with heavy-duty BDS radius arms and diesel-tuned coil springs on the 2019–2026 Ram 2500 4WD diesel platform. The shock tier is the only variable. Contact OFAS at (469) 407-7538 to confirm which shock tier is correct for your use case before ordering.

Installation Notes

Skill Level: Advanced. A 6-inch radius arm lift on the 2019–2026 Ram 2500 diesel platform is a significant suspension job — not a bolt-on leveling kit. Heavy-duty BDS radius arms replace the factory arms entirely. At 6 inches of lift on a diesel work truck platform, this job requires a qualified suspension shop with documented Ram HD experience. Do not attempt DIY installation.

Required Tools:

• Full hydraulic lift rated for Ram 2500 diesel weight
• Torque wrench
• Full socket and wrench set
• Alignment equipment or alignment shop scheduled before driving post-install

Alignment: Full front-end alignment is mandatory after installation. Do not operate the vehicle on public roads before alignment is completed.

Driveline Inspection: At 6 inches of lift, driveshaft angle changes significantly from factory. U-joints operating outside their designed angle range wear rapidly and can fail under diesel towing load. Inspect driveshaft angles and U-joint operating angles after installation — driveshaft modification may be required. Confirm with your installer before the job begins. On a diesel towing platform at 6-inch lift, this inspection is not optional.

Reservoir Routing: Follow BDS and FOX installation instructions for FOX 2.5 PE external reservoir placement. Avoid pinch points and heat sources. Incorrect routing causes premature shock failure.

Torque Specs: Follow BDS-specified torque values included in the installation instructions. Do not substitute generic torque values on a diesel platform under towing and hauling loads.

The Obsidian Take

SKU 1680FPE is the correct kit for the 2019–2026 Ram 2500 4WD diesel owner who wants 6 inches of front lift with geometry-correct radius arms, diesel-tuned coil springs, and FOX 2.5 Performance Elite damping with external reservoir. The heavy-duty BDS radius arms are not an accessory upgrade — they replace the factory radius arms entirely, correcting caster angle, reducing bushing bind under articulation and load, and maintaining consistent suspension geometry at the lifted height. At 6 inches of lift on a diesel platform used for towing and hauling, geometry correction is not optional — it is the difference between a suspension that performs under load and one that degrades it.

Diesel-tuned coil springs are a hard requirement for this application. The Cummins diesel engine carries significantly more front-end weight than the gas engine — the spring rate must be engineered for that weight. A gas-tuned spring under a diesel sags, raises ride height incorrectly, and compromises geometry under load. This is why the gas and diesel kits are separate SKUs and not interchangeable.

The decision between 1680FPE and 1680FS is the shock tier only. Same radius arms, same coil springs, same 6-inch lift geometry. FOX 2.5 PE delivers external reservoir thermal management, larger piston diameter, and more refined damping valving under sustained diesel towing loads. If you pull heavy weight regularly, wheel this truck aggressively, or want the top damping tier available for this application — 1680FPE is the correct choice. If the FOX 2.0 Performance Series meets your use case and budget, 1680FS delivers the same lift geometry at a lower price point.

This kit is for you if: You own a 2019–2026 Ram 2500 4WD diesel and want 6 inches of front lift with geometry-correct BDS radius arms, diesel-tuned coil springs, and FOX 2.5 PE external reservoir damping engineered for a diesel work truck platform.

This kit is not for you if: Your Ram 2500 is gas — order SKU 1681FPE. Your Ram is a 2018 or earlier — order SKU 2100FPE for the 2014–2018 diesel application. Your truck is a Ram 3500, Ram 1500, or 2WD. Confirm your engine, drivetrain, and year before ordering — the kit is non-returnable once installed.

Common Questions

What is the difference between SKU 1680FPE and SKU 1680FS?
Both kits fit the 2019–2026 Ram 2500 4WD diesel and deliver 6 inches of front lift with heavy-duty BDS radius arms and diesel-tuned coil springs. The only difference is the shock tier — 1680FPE uses FOX 2.5 Performance Elite with external reservoir and 1680FS uses FOX 2.0 Performance Series. If you tow heavy regularly or want the top damping tier, order 1680FPE. Call (469) 407-7538 to confirm which fits your use case.

What is the difference between SKU 1680FPE and SKU 1681FPE?
Engine. SKU 1680FPE is for the 2019–2026 Ram 2500 4WD diesel. SKU 1681FPE is for the 2019–2026 Ram 2500 4WD gas. The coil springs are tuned specifically for each engine's front-end weight — they are not interchangeable. Ordering the wrong engine application is a non-returnable error.

Why are the diesel and gas kits different SKUs if everything else is the same?
The diesel engine carries significantly more front-end weight than the gas engine. Coil springs must be tuned for the specific front axle weight they support. Diesel-tuned springs under a gas engine produce an excessively stiff ride. Gas-tuned springs under a diesel sag, produce incorrect ride height, and compromise geometry under load. The spring tune is not interchangeable between engine applications.

Is the driveline inspection actually required at 6-inch lift?
Yes. At 6 inches of lift, driveshaft angles change significantly from factory. U-joints operating outside their designed range wear rapidly and can fail under diesel towing load — a failure mode that is both expensive and dangerous at highway speed under load. The inspection determines whether driveshaft modification is required for your specific truck. It is not optional on a diesel platform at 6-inch lift.

Does this kit include rear lift?
No. SKU 1680FPE is a front lift system only. Rear lift components are not included.

What warranty covers this kit?
BDS suspension components are covered by the BDS No-Fine-Print Warranty. FOX 2.5 Performance Elite shocks carry a FOX 1-year limited warranty.

Manufacturer Data Disclaimer: Specifications sourced from BDS Suspension product documentation and authorized distributor data. Obsidian Forged Auto Supply is an authorized BDS Suspension dealer. Manufacturer specifications are subject to change without notice.

⚠️ California Proposition 65 Warning: This product may expose you to chemicals known to the State of California to cause cancer or reproductive harm. For more information visit P65Warnings.ca.gov.

⚠️ Non-Returnable Notice: Suspension components are non-returnable once installed. Confirm engine, drivetrain, and year before ordering. Call (469) 407-7538 with any fitment questions before your order is placed.