BDS 4-Inch Radius Arm Lift Kit — Ram 2500 SKU: BDS1660FS | Ram 2500 2019–2024 | 4WD | Diesel | 4" Front / 2.5" Rear | FOX 2.0 Performance Series | Coil Spring Front and Rear

A complete 4-inch radius arm suspension lift kit engineered for the 2019–2024 Ram 2500 diesel 4WD. Heavy-duty tubular replacement radius arms mount in the factory location with caster adjustment and OE-style rubber bushings. Diesel-specific progressive rate Pro-Ride coil springs provide the 4-inch front lift. A precision transfer case indexing ring and high-clearance transmission crossmember address driveline geometry at this lift height. The rear uses progressive rate Pro-Ride coil springs for a 2.5-inch rear lift, with a track bar relocation bracket, bump stop extensions, and sway bar links. FOX 2.0 Performance Series shocks front and rear. Supports up to 35-inch tires with 37 x 12.50-inch configurations also referenced in BDS tire/wheel data.

Before ordering: This kit does not fit Ram 2500 models equipped with factory air ride suspension. Confirm your truck does not have the factory air ride package before ordering. Diesel only — gas Ram 2500 is not supported. 2023–2024 Rebel trim is listed in BDS fitment data with all drive types — diesel engine confirmed required regardless. Confirm your specific trim is in the verified fitment list before ordering.

Verified Fitment

Exclusions: Air-ride equipped models. Gas engine. Ram 2500 trims not listed above.

Component Specifications

Lift Configuration (this SKU):

HD Radius Arms:

Pro-Ride Coil Springs — Front:

Pro-Ride Coil Springs — Rear:

FOX 2.0 Performance Series Shocks (front and rear):

Recommended Tire and Wheel Configurations (trimming may be required):

What Is and Is NOT Included

Included — Front:

• Diesel-specific progressive rate Pro-Ride coil springs (pair)
• HD tubular radius arms (pair)
• Forged drop pitman arm
• Track bar relocation bracket
• Sway bar relocation hardware
• Brake line brackets
• Transfer case indexing ring
• High-clearance transmission crossmember
• FOX 2.0 Performance Series front shocks

Included — Rear:

• Progressive rate Pro-Ride coil springs (pair)
• Track bar relocation bracket
• Bump stop extensions
• Sway bar links
• FOX 2.0 Performance Series rear shocks

Excluded — this kit does not fit:

• Ram 2500 with factory air ride suspension

Critical Compatibility

• Air ride exclusion — hard limit: This kit will not fit Ram 2500 models equipped with the factory air ride suspension package. Confirm your truck does not have air ride before ordering.
• Diesel only: Diesel-specific Pro-Ride coil springs are included. Gas Ram 2500 is not supported.
• Coil spring front and rear: This kit uses coil springs for both the front (4-inch) and rear (2.5-inch) lift. There is no block rear option on this kit.
• Pitman arm puller is the only specialty tool required: No welding, cutting, or grinding equipment is needed for this installation. This is a significantly less tool-intensive installation than BDS block and 4-Link kits on adjacent platforms.
• T-case indexing ring and crossmember included: At 4 inches of front lift, driveline geometry requires the transfer case to be clocked and the crossmember to be replaced. Both are included in this kit.
• 2023–2024 Rebel: Listed in BDS fitment data across all drive types. Diesel engine required regardless of drive type designation. Confirm drivetrain before ordering.
• ADAS recalibration: Required after installation at a qualified dealer or ADAS service center. All recalibration costs are the owner's responsibility.

Installation Notes

Professional installation is strongly recommended. This kit is rated Moderate with an estimated installation time of 8–10 hours. A pitman arm puller is the only specialty tool required — no welding, cutting, or grinding equipment is needed.

Verify before beginning:

• Confirm truck does not have factory air ride suspension
• Confirm diesel engine
• Confirm ADAS recalibration appointment scheduled

Professional alignment is required after installation. Refer to the current BDS Suspension installation instructions for SKU BDS1660FS for complete procedures, torque specifications, and component-specific instructions.

The Obsidian Take

The BDS1660FS is the diesel radius arm solution for the 2019–2024 Ram 2500 — 4 inches of front lift on diesel-specific Pro-Ride coil springs, 2.5 inches of rear lift also on coil springs, with HD tubular radius arms replacing the factory stamped steel units. The radius arm approach mounts in the factory location with caster adjustment and OE-style rubber bushings, keeping refinement while correcting geometry. The T-case indexing ring and crossmember are included — BDS has addressed the driveline angle requirements at this lift height. The tool requirement is the lightest of any BDS kit in this catalog: a pitman arm puller is the only specialty tool listed. Air ride is the one hard stop — if the truck has the factory air suspension package, this kit does not fit, period. Confirm that before ordering.

This Product Is For You If

• You own a 2019–2024 Ram 2500 diesel 4WD in a verified trim configuration without factory air ride suspension.
• You want a 4-inch radius arm lift with 2.5 inches of rear coil spring lift.
• You want FOX 2.0 Performance Series shocks with application-specific valving.
• You want 35-inch tire clearance (37-inch configurations also referenced in BDS tire/wheel data).
• Your installer has a pitman arm puller — no welding or cutting equipment required.
• You are prepared to have ADAS sensors professionally recalibrated after installation.

This Product Is Not For You If

• Your Ram 2500 has factory air ride suspension — this kit will not fit.
• Your Ram 2500 has a gas engine.
• Your trim is not in the verified BDS fitment list.
• 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.
• You need more front lift — see the BDS 6-inch kit options for the Ram 2500 diesel.

Product Family Reference

Common Questions

Does this kit fit Ram 2500 trucks with factory air ride?
No. This kit will not fit Ram 2500 models equipped with the factory air ride suspension package. Confirm your truck does not have air ride before ordering.

What is the difference between radius arm and 4-Link lift kits?
The radius arm kit uses heavy-duty replacement arms in the factory mounting positions with caster adjustment and OE-style rubber bushings. The 4-Link conversion replaces the factory radius arms with a full bracket and control arm system for more aggressive geometry correction. The radius arm kit is rated Moderate and requires only a pitman arm puller.

Does this kit use coil springs in the rear?
Yes. Both the front (4-inch) and rear (2.5-inch) use progressive rate Pro-Ride coil springs. There is no block rear option.

What tires will fit?
BDS-referenced configurations: 35 x 12.50 on 17 x 9 at 4.5-inch backspace; 37 x 12.50 on 17 x 9 or 20 x 9 at 5.625-inch backspace. Trimming may be required.

What specialty tools do I need?
A pitman arm puller is the only specialty tool listed for this installation. No welding, cutting, or grinding equipment is required.

Does this kit fit the gas Ram 2500?
No. The Pro-Ride coil springs are diesel-specific.

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

Air Ride Exclusion Warning: This kit will not fit Ram 2500 models equipped with the factory air ride suspension package. Verify your suspension type before ordering.

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. A professional wheel alignment is required after installation.

Tire Fitment Notice: BDS references configurations up to 37 x 12.50-inch tires. 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.