Carli Suspension CS-FFSP-17 Full Progressive Leaf Pack for 2017-24 Ford F-250

Vehicle Fitment

• 2017-2024 Ford F-250 / F-350 Super Duty 4WD (Diesel, 3.5"-4.0" axle tube) - rear full-progressive leaf spring kit

Features

• Full-length progressive leaf spring pack engineered for improved ride quality and articulation
• Designed to match 4.5"-5.5" front lift systems while maintaining a slightly rear-high stance
• Soft initial spring rate at ride height for smoother ride; firms under load to reduce axle wrap and wheel hop
• Includes revised centre-pin location and U-bolts to accommodate up to 37" tires and heavy duty use
• Capable of up to ~15" of suspension travel in compatible setups
• Block-eliminating design - no redundant overload leafs to simplify geometry and improve behaviour
• Includes new U-bolts and rear bump stop drops for correct installation geometry
• Optimised for daily driving, towing, off-road use and large tyre/ lifted builds

Specifications

• Manufacturer: Carli Suspension
• Part Number: CS-FFSP-17
• Fitment: 2017-2024 Ford F-250/F-350 Super Duty 4WD, Diesel, 3.5"-4.0" axle tube
• Lift/Drop: Provides ~1" rear-high stance when used with matching front lift systems
• Construction: Progressive multi-leaf spring pack (9-leaf main + 3-leaf overload) built in partnership with Deaver Spring
• Tire Clearance: Supports up to 37" tires (up to 38" in select installations)

Included Components

• 1x Full progressive rear leaf spring pack (CS-FFSP-17)
• 1x Set of U-bolts for rear leaf pack installation
• 1x Rear bump stop drop bracket kit

Product Description

The Carli Suspension CS-FFSP-17 is a premium full-replacement rear leaf spring kit made for 2017-2024 Ford F-250 and F-350 Super Duty 4WD trucks with a 3.5"-4.0" axle tube. It replaces the factory leaf pack with a fully progressive design to deliver smoother ride quality at ride height and reliable load support under heavier use. The kit is engineered to match higher front lift systems (4.5"-5.5") and gives a slight rear-high stance (~1") to balance the truck's profile and performance.

With its refined spring rate progression, this kit provides improved articulation, better handling under load, and increased usable suspension travel (up to ~15" in compatible setups). Included U-bolts and rear bump stop drops ensure correct geometry and fitment when installing with other suspension upgrades. This leaf spring pack is ideal for truck owners who tow, haul, run larger tires, or use their Super Duty off-road or heavy duty.

Fitment is confirmed through model year 2024; coverage for 2025 is unconfirmed at time of listing. Before purchase, verify your truck's drivetrain, axle tube size, and suspension configuration to ensure compatibility.