BDS 6-Inch Radius Arm Lift Kit — Ram 3500 SKU: BDS1683FPE | Ram 3500 2019–2024 | 4WD | Diesel | 6" Front / 5" Rear | FOX 2.5 Performance Elite Series | 6-Bolt Indexing Ring | With Factory Rear Overload Leaf

A complete 6-inch radius arm suspension lift kit engineered for the 2019–2024 Ram 3500 diesel 4WD — with factory rear overload leaf spring configuration, FOX 2.5 Performance Elite Series shocks, and the standard 6-bolt transfer case indexing ring. 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 6-inch front lift. A precision transfer case indexing ring and high-clearance transmission crossmember address driveline geometry at this lift height. The rear uses a high-strength steel lift block with extended U-bolts for a 5-inch rear lift. Supports up to 37-inch tires.

Before ordering: Diesel 4WD only. For 2024: only Big Horn, Limited, Laramie, Tradesman, and Limited Longhorn trims are verified in BDS fitment data. This kit ships with the standard 6-bolt indexing ring. If your truck has the Aisin heavy-duty 6-speed transmission (8-bolt T-case), select the 8-bolt indexing ring option — the 8-bolt kit also includes an internal shaft seal extension and new shaft seal. This is the With Factory Rear Overload Leaf variant — if your Ram 3500 does not have the factory rear overload leaf, see the without-overload-leaf variant. Dually or Mega Cab models with the Aisin 8-bolt transmission also require DEF Relocation Kit BDS122409, sold separately.

Required separately (conditional):

• BDS122409 — DEF Relocation Kit, required for Dually or Mega Cab with Aisin 8-bolt transmission
• BDS122423 — Manual transfer case shifter extension, if equipped with manual T-case
• BDS122406 — Carrier bearing drop, if equipped with 2-piece rear driveshaft (carrier bearing)

Verified Fitment

Component Specifications

Lift Configuration (this SKU):

HD Radius Arms:

Pro-Ride Coil Springs — Front:

Rear Lift Block:

T-Case Indexing Ring (this build):

FOX 2.5 Performance Elite Series Shocks (front and rear):

Recommended Tire and Wheel Configuration (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 — 6-bolt standard
• High-clearance transmission crossmember
• FOX 2.5 Performance Elite Series front shocks

Included — Rear:

• High-strength steel 5-inch lift block (with overload leaf configuration)
• Extended U-bolts
• FOX 2.5 Performance Elite Series rear shocks

Not included (conditional — may be required):

• BDS122409 — DEF Relocation Kit (required for Dually or Mega Cab with Aisin 8-bolt transmission)
• BDS122423 — Manual transfer case shifter extension (required for manual T-case)
• BDS122406 — Carrier bearing drop (required for 2-piece rear driveshaft)
• 8-bolt indexing ring option — required if equipped with Aisin heavy-duty 6-speed transmission

Critical Compatibility

• With factory rear overload leaf: This kit is configured for Ram 3500 trucks that have the factory rear overload leaf spring. If your truck does not have the factory rear overload leaf, see the without-overload-leaf variant.
• Diesel only: Diesel-specific Pro-Ride coil springs are included. Gas engine models are not supported.
• 2024 trim restriction: Only Big Horn, Limited, Laramie, Tradesman, and Limited Longhorn are verified for the 2024 Ram 3500.
• T-case bolt count — confirm before ordering: This kit ships with the 6-bolt indexing ring as standard. If your Ram 3500 has the Aisin heavy-duty 6-speed transmission, it uses an 8-bolt T-case pattern — select the 8-bolt option. The 8-bolt kit also includes an internal shaft seal extension and new shaft seal.
• Dually or Mega Cab with Aisin 8-bolt transmission: Requires DEF Relocation Kit BDS122409, sold separately.
• Manual T-case: Requires BDS122423, sold separately.
• 2-piece rear driveshaft: Requires BDS122406, sold separately.
• FOX 2.5 vs. FOX 2.0: The FOX 2.5 Performance Elite adds an external reservoir, 2.5-inch body, 7/8-inch shaft, and DSC Dual Speed Compression Adjuster. For the FOX 2.0 version, see BDS1683FS.
• 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.

Verify before beginning:

• Rear spring configuration confirmed as with factory overload leaf
• T-case bolt count confirmed (6-bolt or Aisin 8-bolt)
• Dually or Mega Cab with Aisin 8-bolt — BDS122409 required
• Manual T-case — BDS122423 required
• 2-piece rear driveshaft — BDS122406 required
• 2024 trim confirmed in verified fitment list
• ADAS recalibration appointment scheduled

Professional alignment is required after installation. Refer to the current BDS Suspension installation instructions for SKU BDS1683FPE for complete procedures, torque specifications, and component-specific instructions.

The Obsidian Take

The BDS1683FPE is BDS1683FS with the FOX 2.5 Performance Elite upgrade — same 6-inch diesel Ram 3500 radius arm platform, same 5-inch rear block with overload leaf configuration, same 6-bolt T-case indexing ring, same Moderate difficulty and pitman arm puller only requirement. The 2.5 Performance Elite brings the external reservoir, 7/8-inch shaft, and DSC Dual Speed Compression Adjuster to the same proven chassis. Rear spring pack and T-case bolt count are the two pre-order checks: confirm you have the overload leaf and confirm your T-case is 6-bolt standard before the order goes in.

This Product Is For You If

• You own a 2019–2024 Ram 3500 diesel 4WD with the factory rear overload leaf spring.
• Your 2024 trim is Big Horn, Limited, Laramie, Tradesman, or Limited Longhorn.
• You have confirmed your T-case is 6-bolt standard or have selected the 8-bolt option for the Aisin transmission.
• You want 6 inches of front lift and 5 inches of rear lift with FOX 2.5 Performance Elite shocks and DSC adjuster.
• You want up to 37-inch tire clearance.

This Product Is Not For You If

• Your Ram 3500 does not have the factory rear overload leaf — see the without-overload-leaf variant.
• Your Ram 3500 has a gas engine.
• Your Ram 3500 is 2WD.
• Your 2024 trim is not in the verified list.
• You have not confirmed your T-case bolt count.
• You want FOX 2.0 shocks — see BDS1683FS.
• You want NX2 Nitro Series shocks — see the NX2 variant.

Product Family Reference

Common Questions

What is the difference between BDS1683FPE and BDS1683FS?
The shock option only. BDS1683FPE includes FOX 2.5 Performance Elite Series shocks with external reservoir, 7/8-inch shaft, and DSC adjuster. BDS1683FS includes FOX 2.0 Performance Series shocks. All other components, lift heights, fitment, and requirements are identical.

How do I confirm my T-case bolt count?
Standard Ram 3500 models use a 6-bolt T-case — the included ring fits those. Trucks with the Aisin heavy-duty 6-speed transmission use an 8-bolt pattern and require the 8-bolt option, which also includes an internal shaft seal extension and new shaft seal.

My truck is a Dually or Mega Cab with Aisin — what else do I need?
BDS122409 (DEF Relocation Kit) is required. It is sold separately.

Do I need the carrier bearing drop?
Only if your Ram 3500 has a 2-piece rear driveshaft. If so, BDS122406 is required.

What specialty tools do I need?
A pitman arm puller is the only specialty tool listed.

Does ADAS need to be recalibrated after installation?
Yes. All ADAS sensors require professional recalibration after installation. 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. Specifications are subject to change without notice; confirm current documentation for this SKU at the time of purchase.

Required Legal, Warning, Fitment, and Return Notices

T-Case Notice: This kit ships with a 6-bolt indexing ring. Trucks with the Aisin heavy-duty 6-speed transmission use an 8-bolt T-case pattern and require the 8-bolt indexing ring option, which also includes an internal shaft seal extension and new shaft seal. Dually and Mega Cab models with the Aisin 8-bolt transmission require BDS122409.

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.