BDS 4-Inch 4-Link Lift Kit | FOX 2.5 Performance Elite Shocks | Ram 3500 4WD Diesel 2019–2026 | 6-Bolt Indexing | SKU: 1670FPE

Verified Fitment

Component Specifications

What Is and Is NOT Included

Critical Compatibility

There are two 4-inch 4-link diesel kits for the 2019–2026 Ram 3500 4WD diesel platform — SKU 1670FPE and SKU 1667FPE. 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 1670FPE and 1667FPE 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 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 Confirmation: Confirm 6-bolt front axle configuration before ordering. Text (469) 407-7538 if you cannot confirm — do not estimate. Ordering the wrong axle configuration 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 1670FPE is the premium-tier 4-link system for the 2019–2026 Ram 3500 4WD diesel owner with a 6-bolt front axle who wants 4 inches of front lift with genuine geometry correction, 6-bolt driveline indexing, and FOX 2.5 Performance Elite damping with external reservoir. The 4-link conversion replaces the factory radius arm geometry entirely — corrected caster, eliminated radius arm bind, improved front axle articulation under diesel towing and hauling loads. The 6-bolt indexing ring provides driveline correction at the lifted height, maintaining proper U-joint operating angles where a standard lift would compromise them.

FOX 2.5 PE with external reservoir is the correct shock tier for a Ram 3500 diesel used at or near platform capacity. The external reservoir extends the thermal ceiling under sustained towing loads — maintaining consistent damping performance on long hauls under heavy trailer weight where an internal reservoir shock degrades. Advanced valving delivers precise damping response across the full operating range of a loaded diesel work truck.

The single most important step before ordering this kit is confirming which of the two diesel 4-link SKUs applies to your truck. Both 1670FPE and 1667FPE are 4-inch 4-link systems for the 2019–2026 Ram 3500 4WD diesel at the FOX 2.5 PE tier. The axle configuration is the determining variable. Text (469) 407-7538 with your year, engine, drivetrain, and axle configuration and we will confirm the correct SKU before your order ships — this is a non-returnable kit.

This kit is for you if: You own a 2019–2026 Ram 3500 4WD diesel with a confirmed 6-bolt front axle and want 4 inches of front lift with a true 4-link conversion, 6-bolt driveline indexing, and FOX 2.5 PE external reservoir damping — the top tier available for this application.

This kit is not for you if: Your Ram 3500 is gas — order SKU 1677FPE or SKU 1676FPE depending on rear suspension configuration. Your axle configuration may require SKU 1667FPE instead — confirm before ordering. 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 SKU. Confirm your axle configuration before ordering — the kit is non-returnable once installed.

Common Questions

What is the difference between SKU 1670FPE and SKU 1667FPE?
Both kits are 4-inch 4-link systems for the 2019–2026 Ram 3500 4WD diesel at the FOX 2.5 PE tier. The difference is the front axle configuration — 1670FPE is engineered for the 6-bolt front axle with 6-bolt indexing ring driveline correction. SKU 1667FPE covers an alternate axle configuration. 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 1670FPE is for the Ram 3500 4WD diesel platform only. Diesel-tuned coil springs are engineered for the Cummins diesel's front-end weight — they are 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.

Does this kit include rear lift?
No. SKU 1670FPE 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, drivetrain, and year before ordering. Text (469) 407-7538 with any fitment questions before your order is placed.