BDS 4-Inch 4-Link Lift Kit | FOX 2.5 Performance Elite Shocks | Ram 3500 4WD Diesel 2019–2026 | 6-Bolt Indexing | SKU: 1667FPE

Verified Fitment

Component Specifications

What Is and Is NOT Included

Critical Compatibility

There are two 4-inch 4-link FOX 2.5 PE diesel kits for the 2019–2026 Ram 3500 4WD diesel platform — SKU 1667FPE and SKU 1670FPE. Both are 6-bolt indexing systems. The correct kit depends on your specific front axle configuration. Do not assume which applies to your truck based on year alone. Text (469) 407-7538 with your year, engine, drivetrain, and axle configuration and we will confirm the correct SKU before your order ships.

2019–2026 Ram 3500 4WD Diesel 4-Inch 4-Link Kit Reference

The axle configuration split between 1667FPE and 1670FPE must be confirmed before ordering. Text (469) 407-7538 with your truck's specs and we will verify which SKU applies before your order is placed.

Installation Notes

Skill Level: Advanced. A 4-link front suspension conversion on a Ram 3500 diesel platform is a significant suspension job. The 4-link system replaces the factory radius arm geometry entirely. 6-bolt indexing ring installation requires correct procedure per BDS instructions — improper installation affects driveline geometry and U-joint operating angles. A qualified suspension shop with documented Ram HD diesel experience is required. Do not attempt DIY installation.

Required Tools:

• Full hydraulic lift rated for Ram 3500 diesel weight
• Torque wrench
• Full socket and wrench set
• Alignment equipment or alignment shop scheduled before driving post-install

Alignment: Full front-end alignment is mandatory after installation. Do not operate the vehicle on public roads before alignment is completed.

6-Bolt Axle and SKU Confirmation: Confirm both your 6-bolt front axle configuration and which SKU — 1667FPE or 1670FPE — applies to your specific truck before ordering. Text (469) 407-7538 if you cannot confirm — do not estimate. Ordering the wrong kit is a non-returnable error.

Driveline Inspection: Inspect driveshaft angles and U-joint operating angles after installation. Confirm 6-bolt indexing ring is installed per BDS instructions before the truck is driven. Driveshaft modification may be required depending on your specific truck's configuration — confirm with your installer before the job begins.

Reservoir Routing: Follow BDS and FOX installation instructions for FOX 2.5 PE external reservoir placement. Avoid pinch points and heat sources. Incorrect routing causes premature shock failure.

Torque Specs: Follow BDS-specified torque values included in the installation instructions. Do not substitute generic torque values on a diesel platform under towing and hauling loads.

Tire Fitment: At 4 inches of 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 specifications with your wheel and tire supplier before ordering.

The Obsidian Take

SKU 1667FPE is one of two premium-tier 4-link systems for the 2019–2026 Ram 3500 4WD diesel platform at the FOX 2.5 PE level — the other being SKU 1670FPE. The 4-link conversion is the same in principle across both: corrected caster, eliminated radius arm bind, improved front axle articulation, and 6-bolt driveline indexing for proper U-joint operating angles at the lifted height. FOX 2.5 PE with external reservoir delivers the top damping tier available for this application — extended thermal ceiling under sustained diesel towing loads, advanced valving for precise damping response across the full operating range of a loaded Ram 3500.

The distinction between 1667FPE and 1670FPE is axle configuration — not shock tier, not lift height, not geometry. Both kits deliver the same 4-inch 4-link result with FOX 2.5 PE. The axle configuration is the only variable that determines which SKU applies to your specific truck, and it must be confirmed before ordering. This is not a preference decision — it is a fitment verification step. Text (469) 407-7538 with your year, engine, drivetrain, and axle configuration before placing your order.

For the Ram 3500 diesel owner who tows at or near platform capacity — long hauls, heavy equipment, sustained grades — FOX 2.5 PE with external reservoir is the correct shock tier. The external reservoir extends damping consistency beyond what an internal reservoir shock can sustain under extended load cycles. If your towing profile is lighter or your budget requires the mid-tier, contact OFAS and we will identify the FOX 2.0 equivalent SKU for this platform.

This kit is for you if: You own a 2019–2026 Ram 3500 4WD diesel with a confirmed 6-bolt front axle, you have verified with OFAS that SKU 1667FPE — not 1670FPE — is the correct kit for your axle configuration, and you want 4 inches of front lift with a true 4-link conversion and FOX 2.5 PE external reservoir damping.

This kit is not for you if: You have not confirmed which of the two diesel 4-link SKUs applies to your truck — text (469) 407-7538 first. Your Ram 3500 is gas — order SKU 1677FPE or SKU 1676FPE. Your truck is 2WD, a 2018 or earlier, a Ram 2500, or a Ram 1500. You want a lower shock tier — contact OFAS for the FOX 2.0 equivalent. Confirm your axle configuration and SKU before ordering — the kit is non-returnable once installed.

Common Questions

What is the difference between SKU 1667FPE and SKU 1670FPE?
Both kits are 4-inch 4-link systems for the 2019–2026 Ram 3500 4WD diesel at the FOX 2.5 PE tier with 6-bolt indexing driveline correction. The difference is the specific front axle configuration each kit is engineered for. Do not guess which applies to your truck. Text (469) 407-7538 with your year, engine, drivetrain, and axle configuration and we will confirm the correct SKU before your order is placed.

What is the 6-bolt indexing ring and why does it matter?
The 6-bolt indexing ring provides driveline correction at the lifted height — maintaining proper U-joint operating angles after the 4-link conversion raises the front suspension. Without correct driveline indexing at 4 inches of lift on the Ram 3500 diesel platform, U-joint operating angles can fall outside their designed range, accelerating wear and risking failure under diesel towing loads. The indexing ring must be installed per BDS specifications before the truck is driven.

Does this fit my Ram 3500 gas?
No. SKU 1667FPE is for the Ram 3500 4WD diesel platform only. Diesel-tuned coil springs are engineered for the Cummins diesel's front-end weight — not interchangeable with gas-tuned springs. If your Ram 3500 is gas, order SKU 1677FPE (with factory rear overload leaf) or SKU 1676FPE (without overload leaf). Text (469) 407-7538 to confirm the correct gas SKU for your rear suspension configuration.

How do I confirm whether my truck needs SKU 1667FPE or SKU 1670FPE?
Text (469) 407-7538 with your year, make, model, engine, drivetrain, and axle configuration. Do not order based on assumption — both kits are non-returnable once installed and the axle configuration split is a hard fitment requirement.

Does this kit include rear lift?
No. SKU 1667FPE is a front lift system only. Rear lift components are not included.

Is a driveshaft modification required?
At 4 inches of lift via 4-link conversion, driveshaft angles change from factory. The 6-bolt indexing ring provides driveline correction — but whether additional driveshaft modification is required depends on your specific truck's configuration. Confirm with your installer before the job begins.

What warranty covers this kit?
BDS suspension components are covered by the BDS No-Fine-Print Warranty. FOX 2.5 Performance Elite shocks carry a FOX 1-year limited warranty.

Manufacturer Data Disclaimer: Specifications sourced from BDS Suspension product documentation and authorized distributor data. Obsidian Forged Auto Supply is an authorized BDS Suspension dealer. Manufacturer specifications are subject to change without notice.

⚠️ California Proposition 65 Warning: This product may expose you to chemicals known to the State of California to cause cancer or reproductive harm. For more information visit P65Warnings.ca.gov.

⚠️ Non-Returnable Notice: Suspension components are non-returnable once installed. Confirm engine, axle configuration, correct SKU, drivetrain, and year before ordering. Text (469) 407-7538 with any fitment questions before your order is placed.