BDS 4-Inch Radius Arm + 3-Inch Rear Block | FOX 2.5 Performance Elite | Ram 3500 4WD Diesel 2019-2026 | With Overload Leaf | 6-Bolt

BDS 4-Inch Radius Arm + 3-Inch Rear Block | FOX 2.5 Performance Elite | Ram 3500 4WD Diesel 2019–2026 | With Overload Leaf | 6-Bolt | SKU: 1657FPE

Is This for You?

This kit is for the 2019–2026 Ram 3500 4WD diesel owner with the factory rear overload leaf spring and 6-bolt front axle who wants a matched front and rear lift system — 4 inches up front via radius arm upgrade, 3 inches in the rear via axle block. If you need 6 inches of front lift, see SKU 1683FPE (with overload) or SKU 1682FPE (no overload). If your Ram 3500 does NOT have the factory rear overload leaf, order SKU 1656FPE instead.

The Result

A matched 4-inch front / 3-inch rear lift on the Ram 3500 diesel platform — corrected caster, reduced bushing bind, and FOX 2.5 Performance Elite damping front and rear. The truck sits level and aggressive, clears larger tires, and maintains consistent geometry under diesel towing loads. The FOX 2.5 PE external reservoir shocks deliver heat-managed, consistent damping across sustained use.

Verified Fitment (OFAS Standard)

• Ram 3500 4WD Diesel: 2019–2026 — with factory rear overload leaf spring, 6-bolt front axle

Does NOT fit: Ram 3500 without factory rear overload leaf — order SKU 1656FPE. Does not fit Ram 3500 gas — different coil spring tuning. Does not fit Ram 3500 2WD. Does not fit Ram 3500 2018 or earlier. Does not fit Ram 2500 or Ram 1500.

System Specifications

• SKU: 1657FPE
• Brand: BDS Suspension
• Front Lift Height: 4 inches — radius arm upgrade
• Rear Lift Height: 3 inches — axle block
• Suspension Type: Radius arm upgrade (front) + axle block (rear)
• Shocks: FOX 2.5 Performance Elite — external reservoir, diesel-tuned
• Application: Ram 3500 4WD Diesel 2019–2026 — with overload leaf, 6-bolt axle
• Warranty: BDS No-Fine-Print Warranty + FOX 1-year limited warranty

Master Kit Components

• Heavy-duty BDS radius arms — pair
• Diesel-tuned front coil springs
• FOX 2.5 Performance Elite shocks with external reservoirs
• 3-inch rear axle blocks
• Track bar correction bracket
• All required installation hardware

Installation & Fabrication Notes

• Professional installation required: Front and rear suspension lift requires a qualified suspension shop.
• Alignment mandatory: Full front-end alignment required after installation. Do not drive on public roads before alignment is completed.
• Rear block installation: 3-inch axle blocks must be installed per BDS specifications — confirm U-bolt torque specs and axle centering after installation.
• Driveline inspection: Inspect driveshaft angles and U-joint operating angles after installation.
• External reservoir routing: Follow BDS and FOX instructions for reservoir placement — avoid pinch points and heat sources.
• Torque specs: Torque all fasteners to BDS specification per included installation instructions. Do not estimate.
• 6-bolt axle confirmation: Confirm 6-bolt front axle configuration before ordering.

Wheel & Tire Fitment

At 4-inch front lift on the Ram 3500 diesel platform, typical fitment runs 35–37-inch tires depending on wheel offset and backspacing. Confirm maximum tire diameter and wheel specs with your wheel/tire supplier before ordering. Oversized tires may require trimming or additional modifications.

Installation Warning

Application-specific. Confirm 2019–2026 Ram 3500 4WD diesel WITH factory rear overload leaf and 6-bolt front axle before ordering. Without overload leaf — order SKU 1656FPE. Does not fit gas, 2WD, or 2018 and earlier Ram 3500. Rear axle block U-bolt torque must meet BDS specifications. This product is non-returnable once installed.

Running a diesel, air ride, or overload leaf config? Those details change the kit. Submit your full build specs via the contact form and we’ll confirm the right kit for your application.