Carli Suspension AS-FPAP-17-LVL-PASS Progressive Add-A-Pack Passenger Side Leaf Spring

The Carli Suspension Progressive Add-A-Pack is a proprietary six-leaf design built in the U.S.A. by Deaver Leaf Spring specifically for 2017-2026 Ford F250/F350 4x4 trucks. This is the passenger-side component of the complete add-a-pack system.

How It Works:

The lower overload leaf is removed and replaced with six thinner gauge leaves, transforming the harsh factory overload spring into a smooth, progressive system. 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.

Key Features:

• Provides 1/2-inch to 1-inch high rear stance when paired with Carli Leveling Lifts
• OEM load capacity is maintained while improved ride is achieved, eliminating the incredibly harsh rebound of the factory overload spring
• The progression of the rear spring rate becomes significantly more predictable, resulting in smoother engagement and disengagement for improved ride quality and traction
• Supplied with bump stop drops, U-bolts, and hardware
• Eliminates the factory block
• Built in the USA with premium materials

Important Application Note:

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. Due to this reason, the Progressive Add-A-Pack is not recommended for an F350. For F350 owners seeking optimal ride quality, Carli recommends their Full Replacement Leaf Spring Packs instead.

This passenger-side spring is sold individually and pairs with AS-FPAP-17-LVL-DRIVER to complete the rear suspension upgrade. Designed to work seamlessly with Carli Suspension Systems for maximum performance.