Add-A-Leaf Pack 4" in Axle Tube Dual Center Pin

Features:

• Fits 2003-2013 RAM 2500/3500 4WD Diesel
• Designed for 4" axle tube with dual pins
• Progressive 5-leaf design improves ride quality
• Replaces factory overload spring for smoother ride
• Reduces harsh spring rate ramp-up
• Improves comfort both on and off road
• Bolt-on install with basic hand tools
• Includes E-coated heavy-duty U-bolts
• High-strength GR8 nuts and thick washers included
• Ideal for trucks with 11.5" AAM rear axle
• Compatible with 5.9L and 6.7L Cummins engines

Smooth Out The Ride Without Giving Up Strength

If your Dodge Ram’s rear suspension feels harsh when hitting bumps or driving unloaded, the Synergy Add-A-Leaf Pack is a smart upgrade that delivers noticeable results. Instead of relying on a stiff factory overload spring, this progressive 5-leaf design gives your 2003-2013 Ram 2500 or 3500 a much smoother ride both on pavement and off. Whether you're daily driving, running trails, or towing on the weekends, this pack helps soak up the jolts without compromising the truck's workhorse abilities. It bolts right into place with basic tools, making it an easy weekend job for someone who wants more control and comfort without a full suspension overhaul. You’ll still have the strength for moderate loads, but without the abrupt spring engagement that kicks in with the stock setup. If you’re hauling heavy gear regularly, pairing this kit with airbags is a solid move to keep your truck riding level. It’s a great way to fine-tune your ride and make the rear end work for you, not against you.

Engineered To Replace Overloads And Improve Compliance

The Synergy 8516-02-400 Add-A-Leaf Pack is purpose-built for 2003-2013 Dodge Ram 2500 and 3500 4WD diesel trucks equipped with an 11.5 inch AAM rear axle and 4 inch axle tubes. This progressive 5-leaf system replaces the factory overload spring to eliminate the harsh ride associated with stock setups. By removing the stiff overload, the spring rate becomes more gradual, resulting in a smoother transition under compression without giving up support. The included dual center pins ensure precise fitment, while the heavy-duty U-bolts, extra thick F436 washers, and GR8 tall nuts keep the assembly locked in securely. Each component is E-coated to resist rust and corrosion over time. This kit is best suited for drivers who prioritize ride quality over maximum load capacity, especially when the truck sees more road miles than heavy towing. Installation is fully bolt-on and does not require fabrication, making it a straightforward solution for improving comfort and control.

Fitment: 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013 Dodge RAM 2500/3500 5.9L/6.7L Cummins 4WD Cummins

Notes:

• Fits 2003-2013 RAM 2500 and 2003-2012 RAM 3500 4WD diesel models
• Designed for trucks with 11.5 inch AAM rear axle
• Compatible with 4 inch axle tubes and dual center pins
• Replaces factory overload spring for improved ride quality
• Progressive leaf design reduces harsh suspension engagement
• Will reduce load carrying capacity when overload is removed
• Rear squat may increase when hauling heavy loads
• Recommended to pair with airbags for frequent heavy towing
• Includes all necessary hardware for bolt-on installation
• No cutting, welding, or major modifications required