CARLI SUSPENSION 3.5" LEVELING SUSPENSION SYSTEM - DIESEL - 2023+ F250/F350
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The Suspension System is perfect for those wanting a leveled vehicle with improved performance and ride quality over a basic spacer lift. With extended travel in mind, the Carli Signature Series Shocks are included and feature Zinc plating, a Clear Coat for corrosion resistance, and quality bushings. Plus, they come with boots to protect the shafts and our limited lifetime warranty guarantees exceptional quality.
The truck will sit 3.5” higher in the front and have more wheel travel thanks to the lighter rate Carli Coil Springs. Extended, Stainless Brake Lines firm up braking and ensure there is enough line for the newfound travel. To round off the front end, we include Caster Shims to tighten the steering. We recommend adding an Adjustable Track Bar to center the front axle; for those that do not wish to, we include our High-Clearance Bump Stop Drop to keep the springs clear from the contacting the factory bump stop given the slight driver’s side shift of a leveled Super Duty without a track bar. The front Sway Bar Geometry will need to be addressed with your choice of a Sway Bar Drop Bracket (more economical, maintains the factory Sway Bar End Links) or our Extended Sway Bar links – a FAR more robust option. For those seeking the most possible ride quality, we offer our full replacement Torsion Sway Bar that lightens the most neglected spring rate – the factory sway bar. From the Torsion Sway bar upgrade, one can expect a far more compliant feel and increased articulation with only slightly more body roll.
This system will not achieve a proper rear high stance without the installation of the add-a-pack; it will sit slightly rear low with no rear option added! The F250 Add-a-Pack equipped systems are a nice improvement over stock; the F350 with the Add-a-Pack is still very stiff in the rear as the main pack doesn’t move much unless loaded. For this reason, we do not recommend the Add-a-pack on an F350 or Tremor (as they all have F350 springs); you’re best to leave the factory springs unmodified. One can install the 3″ factory rear block for a leveled stance but rear ride quality will not be optimized (Factory Block PN: HC3Z-5598-A and HC3Z-5598-B). The Add-a-Pack installs in place of the lower, factory overload spring effectively making the factory leaf spring pack progressive in nature. In the 2020 platform, the factory 2″ block is eliminated with the installation of the Add-a-Pack; thus, axle wrap and wheel hop are non-existent. A rear bump stop drop is included to bridge the distance lost by removing the factory block.
Payload capacity is maintained and the rear end becomes a touch softer while being far more planted and predictable. The custom tuning in the rear Signature Series Shocks is optimized to control the combination of our Progressive Add-a-Pack combined with the factory main pack; it’s for this reason we advise against upgrading to the Full Progressive Spring Pack (too much rebound valving for a lighter rate spring).
Wheel and Tire: Factory Wheels SHOULD NOT be run with oversized tires. They’re known to rub the radius arm, sway bar and most concerning – Brake Lines. Factory tires and factory wheels will work without issue but we DO NOT recommend running oversized tires on factory wheels. On our 3.5” Ford Systems, we recommend 17”-18” wheels, no more than 9” wide with 5.5” of backspacing with Carli Fabricated Radius Arms or 5” Backspace with factory arms; 5” will require a bit more trimming. Tires, 37×12.5” will fit with some trimming; 35” will likely fit without trimming. The more rubber, the better the small bump compliance will be at proper inflation pressures. The ride will firm up as you go larger in wheel diameter.