Ford (4WD) Leaf Spring Kit - Carli Suspension - CS-FPAP-45-17

Rear Add-A-Pack
CS-FPAP-45-17
When it comes to the F350, the main spring pack in the rear is already quite stiff and does not compress much unless under load. As a result, installing the Add-A-Pack on an F350 may actually make the rear suspension stiffer, potentially even stiffer than the stock setup. Due to this reason, the Progressive Add-A-Pack is not recommended for an F350. To achieve optimal ride quality, we highly recommend installing Carli Full Replacement Leaf Spring Packs.
Leaf spring, progressive rate, super duty, heavy trucks
Carli Add-A-Pack Rear Leaf Springs, 2017-22 Ford F250/F350 4×4, 3” Lift
17-22 FORD F250/350 4X4 PROGRESSIVE ADD-A-PACK - 3" LIFT
Carli's six-leaf progressive Add-A-Pack rear springs replace the lower overload leaf with six thinner leafs. It maintains factory load capacity while improving ride quality by effectively mitigating the impact of medium to large bumps.
Carli progressive-rate Add-A-Pack rear springs are specifically designed to address the harsh rebound of the factory overload spring they replace. When used in conjunction with a Carli Suspension System, they effectively mitigate the impact of medium to large bumps. By replacing the lower overload springs, which are typically one inch thick and do not follow the contour of the rest of the pack, with a mini progressive six-leaf pack, the overall capacity of the truck remains unchanged as determined by the factory springs. However, the progression of the rear spring rate becomes significantly more predictable.
This modification results in a smoother engagement and disengagement of the spring, thereby improving both ride quality and traction.
Fits 2017-23 Ford F250/F350 4×4
Progressive design addresses the harsh rebound of the factory overload spring
Includes 2-inch block, bump stop drops, U-bolts, and hardware
Three-inch lift provides slightly rear-high stance with 4.5-inch and 5.5-inch lifts
Load capacity is maintained, ride quality is improved
17-23 FORD F250/350 4X4 PROGRESSIVE ADD-A-PACK - 3" LIFT
Carli Add-A-Pack Rear Leaf Springs, 2017-22 Ford F250/F350 4×4, 3” Lift, CS-FPAP-45-17
Carli Add-A-Pack Rear Leaf Springs, 2017-23 Ford F250/F350 4×4, 3” Lift
Parts Included: AS-FPAP-17-45-DRIVER; AS-FPAP-17-45-PASS
Fits 2017-23 Ford F250/F350 4×4
Progressive design addresses the harsh rebound of the factory overload spring
Includes 2-inch block, bump stop drops, U-bolts, and hardware
Three-inch lift provides slightly rear-high stance with 4.5-inch and 5.5-inch lifts
Load capacity is maintained, ride quality is improved
California Proposition 65: WARNING: This product can expose you to chemicals including arsenic, which is known to the State of California to cause cancer. For more information, go to www.P65Warnings.ca.gov.

Detailed Fitment Results
Year Make Model Drive Type 2017 Ford F-250 Super Duty 4WD 2017 Ford F-350 Super Duty 4WD 2018 Ford F-250 Super Duty 4WD 2018 Ford F-350 Super Duty 4WD 2019 Ford F-250 Super Duty 4WD 2019 Ford F-350 Super Duty 4WD 2020 Ford F-250 Super Duty 4WD 2020 Ford F-350 Super Duty 4WD 2021 Ford F-250 Super Duty 4WD 2021 Ford F-350 Super Duty 4WD 2022 Ford F-250 Super Duty 4WD 2022 Ford F-350 Super Duty 4WD 2023 Ford F-250 Super Duty 4WD 2023 Ford F-350 Super Duty 4WD 2024 Ford F-250 Super Duty 4WD 2024 Ford F-350 Super Duty 4WD 2025 Ford F-250 Super Duty 4WD 2025 Ford F-350 Super Duty 4WD 2026 Ford F-250 Super Duty 4WD 2026 Ford F-350 Super Duty 4WD