BDS 4-Inch Radius Arm Lift Kit — Ram 2500 SKU: BDS1699FS | Ram 2500 2019–2025 | 4WD | Gas | 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 2019–2025 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 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 — three hard exclusions apply to this kit:

1. Air ride: This kit will NOT fit Ram 2500 models equipped with factory air ride suspension.
2. Gas only: This kit is gas-specific and will NOT fit diesel Ram 2500.
3. Power Wagon: This kit will NOT fit Power Wagon models.

Confirm your truck is a non-air-ride, non-Power Wagon, gas engine Ram 2500 before ordering. Exhaust modification is also required to clear the front driveshaft — the vehicle can be driven without the front driveshaft to an exhaust shop for modification before reinstalling.

Model year note: The BDS fitment data provided covers 2019–2025. If you own a 2026 or 2027 Ram 2500, confirm compatibility directly with BDS before ordering. Several 2019–2020 trims (HD Limited, SLT, R/T, Sport, SLT HD, HD Limited Rambox) appear in BDS fitment data with "ALL" fuel or drive type designations — gas engine is required regardless of that designation.

Verified Fitment

Hard exclusions: Air-ride equipped models. Diesel engine. Power Wagon. 2026–2027 model years not verified in supplied BDS fitment data — confirm with BDS before ordering.

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

This kit does not fit (hard exclusions):

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

Critical Compatibility

• Air ride exclusion — hard limit: This kit will not fit Ram 2500 models equipped with factory air ride suspension. Confirm 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 exclusion — hard limit: 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 installed to an exhaust shop for modification before reinstallation.
• Coil spring front and rear: Both the front (4-inch) and rear (2.5-inch) use progressive rate Pro-Ride coil springs.
• T-case indexing ring and crossmember included: At 4 inches of lift, the T-case indexing ring and new transmission crossmember are required for front driveshaft use. Both are included.
• 2026–2027 model years: The BDS fitment data supplied covers 2019–2025. If your Ram 2500 is a 2026 or 2027 model year, confirm compatibility with BDS before ordering.
• Mixed fuel/drive type rows: Several 2019–2020 trims (HD Limited, SLT, R/T, Sport, SLT HD, HD Limited Rambox) appear in BDS fitment data with "ALL" fuel or drive type designations. This kit is gas-specific — confirm gas engine before ordering regardless.
• ADAS recalibration: Required after installation. 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.

Exhaust modification: Required before the front driveshaft can be reinstalled. 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
• Exhaust modification plan in place
• ADAS recalibration appointment scheduled

Professional alignment is required after installation. Refer to the current BDS Suspension installation instructions for SKU BDS1699FS for complete procedures, torque specifications, and component-specific instructions.

The Obsidian Take

The BDS1699FS is the gas engine companion to BDS1660FS — same 4-inch radius arm lift concept, same coil spring rear at 2.5 inches, same FOX 2.0 shocks, same pitman arm puller as the only specialty tool. Gas-specific Pro-Ride coil springs replace the diesel-specific units. The three exclusions are non-negotiable before this kit ships: no air ride, no diesel, no Power Wagon. The exhaust modification is the one pre-installation requirement that needs a plan before the lift goes in — get the exhaust shop scheduled before the kit arrives. For 2026 or 2027 Ram 2500 owners, the supplied BDS fitment data stops at 2025; confirm directly with BDS before ordering.

This Product Is For You If

• You own a 2019–2025 Ram 2500 gas 4WD in a verified trim without factory air ride suspension and not a Power Wagon.
• 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).
• You are prepared to complete the required exhaust modification before front driveshaft reinstallation.
• Your installer has a pitman arm puller — no welding or cutting required.

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 diesel engine — see BDS1660FS.
• Your Ram 2500 is a Power Wagon — this kit will not fit.
• Your Ram 2500 is a 2026 or 2027 model — confirm with BDS before ordering.
• You are not prepared to complete the required exhaust modification.
• 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

Does this kit fit the Power Wagon?
No. Power Wagon models are explicitly excluded from this kit.

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. The Pro-Ride coil springs are gas-specific. For the diesel radius arm lift, see BDS1660FS.

Why is an exhaust modification required?
At 4 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 the modification before reinstalling.

Does this kit cover 2026 and 2027 Ram 2500?
The BDS fitment data supplied for this kit covers 2019–2025. Confirm compatibility with BDS directly before ordering a 2026 or 2027 model.

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

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

Hard Exclusion Notice: This kit will NOT fit Ram 2500 models with factory air ride suspension, diesel engines, or Power Wagon configuration. Verify all three before ordering.

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.

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.