Carli Suspension Dodge 3" Unchained 3.5 Long Arm System | 2012–2013 Ram 2500/3500 Diesel 4WD

Carli Suspension Dodge 3" Unchained 3.5 Long Arm System | 2012–2013 Ram 2500/3500 Diesel 4WD | SKU: CS-DUC35-12-D

Is This for You?

This system is for the 2012–2013 Ram 2500 Diesel or 2012 Ram 3500 Diesel 4WD owner who wants Carli’s maximum-performance Unchained 3.5 long arm conversion with 3 inches of lift. This is a full long arm conversion requiring professional fabrication and weld-on frame mounts — not a bolt-on system. If you have a gas-powered Ram 2500/3500, stop here — diesel-specific geometry. If you have a 2013 Ram 3500, stop here — confirm compatibility via contact form. If you want a bolt-on system, see the Pintop listings. If you have a 2014+ Ram 2500/3500, stop here — different platform, see the 2014–2022 listings.

The Result

Maximum front suspension travel and desert performance on the 2012–2013 Ram HD platform. King 3.5 shocks with long arm geometry eliminate the binding and limited travel of the factory short arm setup — purpose-built for serious off-road use while maintaining on-road composure under load.

Verified Fitment (OFAS Standard)

• Ram 2500 Diesel 4WD: 2012–2013
• Ram 3500 Diesel 4WD: 2012 only — confirm 2013 Ram 3500 compatibility via contact form

Does NOT fit: Ram 2500/3500 Gas. Does NOT fit 2014+ Ram 2500/3500 — different platform. Does NOT fit DRW without confirmation. Confirm year, engine, and configuration before ordering.

System Specifications

• SKU: CS-DUC35-12-D
• Brand: Carli Suspension
• System: Unchained 3.5 Long Arm
• Lift: 3 inches (front)
• Front Shocks: King 3.5
• Conversion: Long arm radius arm conversion
• Mount Type: Weld-on frame mounts — fabrication required
• Application: 2012–2013 Ram 2500 / 2012 Ram 3500 Diesel 4WD
• Drivetrain: 4WD only
• Engine: Diesel only

Master Kit Components

• King 3.5 front shocks — Carli-tuned
• Long arm radius arm conversion components
• Weld-on frame mounts
• Carli front coil springs
• Confirm full kit contents via contact form or Carli spec sheet

Installation & Fabrication Notes

• Professional fabrication required: Weld-on frame mounts require a qualified fabricator with MIG/TIG capability. This is not a bolt-on system.
• Alignment: Full front alignment required after installation. Carli recommends a qualified alignment shop familiar with long arm lifted trucks.
• Torque specs: Follow Carli installation manual torque specifications for all suspension fasteners.
• Break-in period: Allow 500–1,000 miles for suspension components to settle before final alignment check.

Wheel & Tire Fitment

3-inch long arm lift opens significant tire fitment on the Ram HD platform. Confirm wheel backspacing, offset, and tire diameter with your fabricator and installer. Submit your current wheel and tire setup via the contact form for a fitment recommendation.

Is your Ram a 2012–2013 2500 or 2012 3500 Diesel 4WD? What cab and bed configuration? Submit via the contact form and we’ll confirm fitment and fabrication requirements before it ships.