BDS 5.5-Inch Radius Arm Lift Kit — Ram 2500 SKU: BDS1681FS | Ram 2500 2019–2025 | 4WD | Gas | 5.5" Front / 4.5" Rear | FOX 2.0 Performance Series | Coil Spring Front and Rear

A complete 5.5-inch radius arm suspension lift kit engineered for the 2019–2025 Ram 2500 gas 4WD. Heavy-duty tubular replacement radius arms mount in the factory location with caster adjustment and OE-style rubber bushings. Gas-specific progressive rate Pro-Ride coil springs provide the 5.5-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 4.5-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 37-inch tires.

Before ordering: This kit will not fit Ram 2500 models with factory air ride suspension, diesel engines, or Power Wagon configuration — confirm all three before ordering. Exhaust modification is required to clear the front driveshaft — the vehicle can be driven without the front driveshaft to an exhaust shop. Trucks with a manual shift transfer case require Transfer Case Shifter Extension BDS122422, sold separately.

Required separately (conditional):

• BDS122422 — Transfer Case Shifter Extension, if equipped with manual shift T-case

Verified Fitment

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:

• Gas-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

Not included (conditional — may be required):

• BDS122422 — Transfer Case Shifter Extension (required for manual shift T-case)

This kit will not fit:

• Ram 2500 with factory air ride suspension
• Ram 2500 diesel engine
• Ram 2500 Power Wagon

Critical Compatibility

• Air ride: This kit will not fit Ram 2500 models equipped with factory air ride suspension. Confirm your suspension type before ordering.
• Gas engine only: Gas-specific Pro-Ride coil springs are included. Diesel Ram 2500 is not supported — see BDS1660FS for the diesel radius arm kit.
• Power Wagon: This kit will not fit Power Wagon models.
• Exhaust modification required: Exhaust modification is required to clear the front driveshaft. The vehicle can be driven without the front driveshaft to an exhaust shop.
• Manual shift T-case: Trucks equipped with a manual shift transfer case require BDS122422 (Transfer Case Shifter Extension), sold separately.
• Coil spring front and rear: Both the front (5.5-inch) and rear (4.5-inch) use progressive rate Pro-Ride coil springs.
• T-case indexing ring and crossmember included: At 5.5 inches of front lift, driveline geometry requires the transfer case to be indexed and the crossmember replaced. Both are included.
• Difficulty rated Difficult: This kit is rated Difficult — one level above the 4-inch BDS1699FS (Moderate). Confirm installer experience before scheduling.
• ADAS recalibration: Required after installation. All recalibration costs are the owner's responsibility.

Installation Notes

Professional installation is strongly recommended. This kit is rated Difficult with an estimated installation time of 8–10 hours. Refer to the current BDS Suspension installation instructions for SKU BDS1681FS for complete tool requirements, procedures, and torque specifications.

Exhaust modification: Required before front driveshaft reinstallation. The Ram 2500 can be driven without the front driveshaft to an exhaust shop.

Verify before beginning:

• Confirm truck does not have factory air ride suspension
• Confirm gas engine
• Confirm truck is not a Power Wagon
• Transfer case type — manual shift requires BDS122422
• Exhaust modification plan in place
• ADAS recalibration appointment scheduled

Professional alignment is required after installation.

The Obsidian Take

The BDS1681FS is the step up from BDS1699FS on the same 2019–2025 gas Ram 2500 platform — 5.5 inches of front lift and 4.5 inches of rear lift versus the 4-inch/2.5-inch BDS1699FS, with the same HD tubular radius arms, same coil spring front and rear approach, and same FOX 2.0 shocks. The difficulty rating moves to Difficult. The same three exclusions apply: no air ride, no diesel, no Power Wagon. The manual T-case check is a requirement at this lift height — if your truck has a manual shift T-case, source BDS122422 before installation day. The exhaust modification carries over from BDS1699FS. If 5.5 inches of front lift and 4.5 inches of rear lift is more than the build needs, BDS1699FS covers the same platform at 4 inches front / 2.5 inches rear at Moderate difficulty.

This Product Is For You If

• You own a 2019–2025 Ram 2500 gas 4WD in a verified trim without factory air ride and not a Power Wagon.
• You want 5.5 inches of front lift and 4.5 inches of rear lift on coil springs via HD radius arms.
• You want FOX 2.0 Performance Series shocks with application-specific valving.
• You want 37-inch tire clearance.
• You are prepared to complete the required exhaust modification.
• You have confirmed your transfer case type (manual T-case requires BDS122422).
• Your installer is experienced with Difficult-rated installations.

This Product Is Not For You If

• Your Ram 2500 has factory air ride suspension.
• Your Ram 2500 has a diesel engine — see BDS1660FS.
• Your Ram 2500 is a Power Wagon.
• You are not prepared to complete the required exhaust modification.
• You have a manual shift T-case and have not sourced BDS122422.
• You want the 4-inch/2.5-inch configuration at Moderate difficulty — see BDS1699FS.
• 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 BDS1681FS and BDS1699FS?
Lift height and difficulty. BDS1681FS delivers 5.5 inches of front lift and 4.5 inches of rear lift and is rated Difficult. BDS1699FS delivers 4 inches of front lift and 2.5 inches of rear lift and is rated Moderate. Both fit the same 2019–2025 Ram 2500 gas 4WD platform and share the same exclusions.

Does this kit fit Ram 2500 trucks with factory air ride?
No. This kit will not fit models equipped with the factory air ride suspension package.

Does this kit fit the diesel Ram 2500?
No. Gas-specific Pro-Ride coil springs are included. For diesel, see BDS1660FS.

Does this kit fit the Power Wagon?
No. Power Wagon models are not compatible with this kit.

My truck has a manual shift transfer case — what do I need?
BDS122422 (Transfer Case Shifter Extension) is required. It is sold separately and not included in this kit.

Why is an exhaust modification required?
At 5.5 inches of lift, the front driveshaft angle requires exhaust clearance the factory exhaust does not provide. The vehicle can be driven without the front driveshaft to an exhaust shop for modification.

Does ADAS need to be recalibrated after installation?
Yes. 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

Fitment Notice: This kit will not fit Ram 2500 models with factory air ride suspension, diesel engines, or Power Wagon configuration.

Exhaust Modification Warning: Exhaust modification is required to clear the front driveshaft. This must be completed as part of the installation process. The vehicle can be driven without the front driveshaft to an exhaust shop.

Manual T-Case Notice: Trucks equipped with a manual shift transfer case require BDS122422 (Transfer Case Shifter Extension), sold separately.

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. This kit is rated Difficult. A professional wheel alignment is required after installation.

Tire Fitment Notice: BDS references configurations up to 37 x 13.50-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.