Progressive Deaver Add-a-Pack

Features:

• Provides 2.0 inches of rear lift
• Progressive spring design for smoother ride
• Maintains factory load capacity
• Improves rear traction and stability
• Replaces factory overload leaf spring
• Built by Deaver Spring in the USA
• Includes U-bolts and all hardware
• Compatible with 2005–2007 F250/F350 4x4
• Designed for 3.5" rear axle tubes
• Enhances handling under load or empty

A Better Ride Without Sacrificing Load Capacity

If you've ever driven your 2005 to 2007 Super Duty unloaded and felt the harshness from the rear end, you're not alone. The factory overload leaf in the rear spring pack does its job when the truck is heavily loaded, but it also makes daily driving feel stiff and unforgiving. The Carli CS-FPAP-05 Progressive Deaver Add-a-Pack is designed to change that. Built exclusively for Carli by the suspension experts at Deaver Spring Manufacturing, this add-a-pack swaps the factory overload leaf for a series of thinner, progressive-rate leaves. The result is a smoother ride on the street while still keeping the truck’s original load-handling capability intact.

Designed to Perform, Built to Last

What makes this upgrade stand out is how it improves comfort without compromising utility. The progressive design allows the rear suspension to respond more predictably, giving you better traction and control whether you're daily driving, towing, or exploring back roads. It also adds two inches of lift at the rear, which helps level the stance and provides extra clearance for larger tires. Carli includes all necessary hardware, including U-bolts, for a hassle-free install. If you're running a 3.5-inch axle tube on a 4x4 F250 or F350 from 2005 to 2007, this setup is ready to bolt in. It's a great way to transform your ride quality while keeping your truck fully functional and work-ready.

Fits: 2005, 2006, 2007 Ford F250/F350