BDS 6-Inch Lift Kit — Dodge/Ram 2500 / Ram 3500 SKU: BDS6673FS | Ram 2500 2009–2013 / Ram 3500 2009–2012 | 4WD | Diesel | 6" Front / 5" Rear | FOX 2.0 Performance Series | Leaf Springs Rear | 4-Inch Axle

A complete 6-inch suspension lift kit engineered for the 2009–2013 Dodge/Ram 2500 and 2009–2012 Ram 3500 diesel 4WD. Diesel-specific progressive rate Pro-Ride coil springs provide the 6-inch front lift. BDS-engineered new lower control arms are longer than stock to rotate the axle for proper alignment, paired with a relocation mounting bracket to flatten the upper control arm angle. Forged drop pitman arm and track bar bracket correct steering geometry. The rear uses progressive rate multi-leaf springs for a 5-inch rear lift, with longer U-bolts. This is the leaf spring rear option on the 4-inch axle configuration. FOX 2.0 Performance Series shocks front and rear. Clears up to 36-inch tires.

Before ordering: This kit fits 2009–2013 Dodge/Ram 2500 and 2009–2012 Ram 3500 diesel 4WD. You must measure your rear axle tube diameter before ordering — this kit is configured for the 4-inch axle. Two axle diameters exist on this generation Ram and the wrong selection will result in an incompatible rear kit. Some 4-inch axle models with dual overloads require U-bolt 4068 (sold separately). This kit is diesel-specific — gas engine models are not supported. The 2010 Ram 3500 appears in BDS fitment data with "ALL" fuel types — confirm your 2010 Ram 3500 is a diesel before ordering. Rear brake lines BDS102009 will not fit 2012–2013 models. If driveline vibration occurs after installation, transfer case drop kits are available separately (see Critical Compatibility). Welding equipment, a cut-off wheel or equivalent, and a grinder/sanding disc are required specialty tools — confirm your installer has these before scheduling.

Required separately (conditional):

• U-bolt 4068 — some 4-inch axle models with dual overloads require this; confirm before ordering
• Transfer case drop kit (if driveline vibration occurs): 122602 (03–05 Diesel Auto), 122605 (06–08 Diesel Auto), or 122606 (03–13 Diesel Auto with OE mount PN 52121938AA). Auto transmission models only. Alternatively, T-case index kit 122801 (auto) or 122802 (manual).

Verified Fitment

Diesel only. Gas engine models are excluded.

Component Specifications

Lift Configuration (this SKU):

Pro-Ride Coil Springs — Front:

Control Arms:

Rear Lift — Leaf Springs:

FOX 2.0 Performance Series Shocks (front and rear):

What Is and Is NOT Included

Included — Front:

• Diesel-specific progressive rate Pro-Ride coil springs (pair)
• BDS-engineered lower control arms (pair — longer than stock)
• Upper control arm relocation mounting brackets
• Forged drop pitman arm
• Track bar relocation bracket
• Sway bar links
• Bump stops
• FOX 2.0 Performance Series front shocks

Included — Rear:

• Multi-leaf progressive rate rear springs (5-inch, 4-inch axle configuration)
• Extended U-bolts
• FOX 2.0 Performance Series rear shocks

Not included (conditional — may be required):

• U-bolt 4068 — some 4-inch axle models with dual overloads; confirm before ordering
• Transfer case drop kits (if driveline vibration occurs): 122602, 122605, or 122606 (auto transmission only); or T-case index kits 122801 (auto) / 122802 (manual)
• BDS102009 rear brake lines — not compatible with 2012–2013 models

Critical Compatibility

• Rear axle measurement required — 4-inch axle configuration: This kit is built for the 4-inch axle. Two rear axle diameters exist on this generation Ram. Measure your rear axle tube before ordering. The wrong axle selection will result in an incompatible rear kit.
• 4-inch axle dual overload note: Some 4-inch axle models equipped with dual overloads will require U-bolt 4068. Confirm your rear axle configuration before ordering.
• Diesel only: Diesel-specific Pro-Ride coil springs are included. Gas engine models are not supported.
• 2010 Ram 3500 fuel type: BDS fitment data lists the 2010 Ram 3500 as all fuel types. Confirm your 2010 Ram 3500 is a diesel engine before ordering.
• 2012–2013 rear brake lines: BDS102009 rear brake lines will not fit 2012 or 2013 model year trucks.
• Transfer case drop kits: Not included and not required for standard installation. If driveline vibration occurs after installation, transfer case drop kits are available: 122602 (03–05 Diesel Auto), 122605 (06–08 Diesel Auto), or 122606 (03–13 Diesel Auto with OE mount PN 52121938AA). All T-case drop kit options fit automatic transmission models only. T-case index kits 122801 (auto) or 122802 (manual) are also available.
• 6.7L Diesel and dual rear shock kit: If also installing dual rear shock kit 122009, exhaust modification is required on 6.7L diesel models for that specific accessory.
• Welding and grinding required: Cut-off wheel or equivalent, grinder/sanding disc, and welding equipment are listed as required specialty tools. Confirm installer capability before scheduling.
• ADAS recalibration: Required after installation at a qualified dealer or ADAS service center. All recalibration costs are the owner's responsibility.
• Tire fitment: Clears up to 36 x 12.50-inch tires. Minor trimming may be required.

Installation Notes

Professional installation is strongly recommended. This kit is rated Moderate with an estimated installation time of 6–8 hours. Specialty tools required: cut-off wheel or equivalent, grinder/sanding disc, pitman arm puller, and welding equipment. Confirm your installer has all required tools before scheduling.

Verify before beginning:

• Rear axle tube diameter (4-inch confirmed)
• Presence of dual overloads (may require U-bolt 4068)
• Transmission and transfer case type (relevant to T-case drop kit selection if needed)
• 2012–2013 model year (BDS102009 rear brake lines not compatible)
• ADAS recalibration appointment scheduled

Professional alignment is required after installation. Refer to the current BDS Suspension installation instructions for SKU BDS6673FS for complete procedures, torque specifications, and component-specific instructions.

The Obsidian Take

The BDS6673FS is the leaf spring rear option for the first-generation Cummins-era Ram 2500/3500 lift — 6 inches of front lift on diesel-specific Pro-Ride coil springs with BDS's engineered longer lower control arms for correct axle rotation, and 5 inches of rear lift via multi-leaf progressive rate springs that eliminate the axle wrap issues of a block configuration while maintaining factory payload ratings. FOX 2.0 Performance Series shocks are application-tuned throughout. The leaf spring rear is the better choice over blocks for this platform if payload consistency, axle wrap control, and a stable feel under load are priorities. Two items to confirm before this kit ships: measure your rear axle tube diameter (4-inch vs. the alternative) and check for dual overloads that would require U-bolt 4068. Both are easy to confirm with a tape measure and a look at the rear axle assembly.

This Product Is For You If

• You own a 2009–2013 Dodge/Ram 2500 or 2009–2012 Ram 3500 diesel 4WD with a confirmed 4-inch rear axle.
• You want the leaf spring rear option for reduced axle wrap, improved stability, and maintained factory payload ratings over a block configuration.
• You want 6 inches of front lift and 5 inches of rear lift with FOX 2.0 Performance Series shocks.
• You want up to 36-inch tire clearance.
• Your installer has welding equipment, a cut-off wheel, and a grinder on hand.
• You have confirmed your rear axle diameter and dual overload configuration before ordering.

This Product Is Not For You If

• You have not measured your rear axle tube diameter — the wrong axle selection results in an incompatible kit.
• Your Ram has a gas engine.
• Your Ram is 2WD.
• You are on a 2012 or 2013 model and need BDS102009 rear brake lines — they will not fit.
• Your installer does not have welding equipment or a cut-off wheel.
• You want the block rear option — see the block kit variant.
• 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

Why do I need to measure my rear axle before ordering?
BDS confirms that two different rear axle tube diameters exist on this generation Ram. Ordering the wrong axle configuration produces an incompatible rear kit. Use a tape measure on the axle tube and confirm before placing your order.

What does "dual overloads" mean for U-bolt selection?
Some 4-inch axle models are equipped with dual overload leaf springs. If your truck has dual overloads, U-bolt 4068 is required. Inspect your rear spring pack and confirm with BDS or your installer if uncertain.

Why choose leaf springs over blocks for the rear?
Leaf springs eliminate axle wrap, create a more controlled and stable feel, maintain factory payload weight ratings, and use a multi-leaf progressive design for a smoother ride. Block kits are simpler to install but do not address axle wrap.

What if I have driveline vibration after installation?
Transfer case drop kits are available separately. Three automatic transmission options exist: 122602 (03–05 Diesel Auto), 122605 (06–08 Diesel Auto), 122606 (03–13 Diesel Auto with OE mount PN 52121938AA). T-case index kits 122801 (auto) or 122802 (manual) are also available. Manual transmission models are not covered by the T-case drop kit options.

Do my rear brake lines need to be replaced?
If your truck is a 2012 or 2013 model, note that BDS102009 rear brake lines are not compatible with those years. Confirm your brake line requirements with BDS before ordering.

Does this kit fit the gas Ram 2500?
No. The Pro-Ride coil springs are diesel-specific. Gas engine models are not supported.

Welding equipment is listed as a required specialty tool — what is it used for?
BDS lists welding equipment alongside a cut-off wheel and grinder as specialty tools for this installation. Confirm the specific welding requirement with your installer and the BDS installation instructions before scheduling.

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

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. Welding equipment, a cut-off wheel or equivalent, and a grinder/sanding disc are required specialty tools. A professional wheel alignment is required after installation.

Rear Axle Warning: Two rear axle tube diameters exist on this generation Ram. Measure your rear axle tube before ordering. Ordering the wrong axle configuration produces an incompatible rear kit.

Tire Fitment Notice: Up to 36 x 12.50-inch tires are supported. 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.