Carli Spec 4.5/5.5" 17-22 Ford Super Duty Backcountry System Diesel

17-22 Carli Spec Backountry 4.5/5.5 System

Lift Height Note:
2020 Super Duties were lowered 1” from the factory when comparing to the 2017-19. Further, the Tremor Package is a factory 2” lift on the 20-22 platform putting them 1” taller than the 17-19. As these all START at different heights yet utilize the same lifts, the stated lift height is different. They’ll all end up measuring the same with the lift installed!

The Super Duty Backcountry 2.0 system is designed for people seeking the best ride on and off-road quality on a budget; basically, the Commuter for those that want to have a little dirt-road fun in their 8,500lb truck without losing the on-road ride quality or usability for which the truck was designed. You’re no longer limited to the highway while gravel roads become uninteresting as you can drive them at speed with one hand on the wheel.

Utilizing Carli SPEC 2.0″ Diameter, Remote Reservoir shocks, we’ve developed a tune that delivers all around comfort and ride quality designed for on-road, in town, highway, towing/hauling as well as slow to mid speed off road use. The remote reservoir Carli SPEC 2.0 boasts 6063 Aluminum construction, anodized body for corrosion resistance, 5/8″ hardened steel chrome plated shaft, full serviceability & rebuildability and are built with 1-piece bushings in the 6061 billet rod-ends. These shocks are spec’d with a premium 5WT oil to balance lubricity, consistent damping and the widest available range in temperature variation. We back these with a 1-year warranty, serviced by Carli

The truck will sit 4.5 or 5.5” higher (depending on the model year) in the front and have more wheel travel thanks to the taller, Progressive Rate Coil Springs. Radius Arm Drop Brackets reset the pivot point and keep the travel linear for the best ride. The front Sway Bar Geometry will need to be addressed with your choice of a Sway Bar Drop Bracket & Carli Extended Sway bar End Link combination or, for those seeking the most possible ride quality, we offer our full replacement Torsion Sway Bar that lightens the most commonly 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. Bump Stop Drops protect the shocks from over-compressing, the Adjustable Track Bar centers the front axle and 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.

The rear can be outfitted with a replacement Full Progressive Spring Pack (reduces capacity to a “light” ¾-ton) or factory leaf-pack modifying Progressive Add-a-Pack (eliminates the factory block and maintains payload capacity; pairs with a rear bump stop drop). This is where the F250 and F350 are a bit different. Since 2008, the main spring packs on these two trucks is different; the F250 has a lighter rate spring pack (2 main leaf springs) than its 350 counterpart (3 main leaf springs). 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. We recommend the Full Replacement Leaf Spring packs for both trucks but especially the F350 given the super-stiff factory springs. If you own an F250 built with the Tremor or high-capacity tow package, these are equipped with an F350 rear spring and should avoid the add-a-pack, as well. If capacity is a concern, an aftermarket airbag system should be installed to complement the Full Progressive Leaf Springs to restore the F350 capacity. We recommend a system that will allow the airbags to disconnect from the lower mount during suspension cycling to ensure you’re able to take advantage of all your rear suspension travel. The Full Progressive Leaf Spring Pack will shift the axle slightly forward in the wheel well to ensure maximum tire clearance for a 37” M/T at full compression.

Base Kit Includes:

• CS-FMRC-05 - 4.5" Lift Multi Rate Ford Coils
• CS-F45SPKG-CS20RR-A - Carli SPEC Ford 4.5/5.5'' Backcountry Shock Package
• CS-FORDBBL-45-17 - Extended Braided Brake Lines
• CS-FCASTERSHIM-4.5 - Caster Correction Shim
• CS-FBDF-4.5-17 - High-Clearance Front Bump Stop Drops
• CS-FATB-17 - Ford Adjustable Track Bar

Fitment Guide:

• 2017-2022 Ford Superduty F250 / F350 4X4 Diesel 

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 4.5” Ford Systems, we recommend 17”-18” wheels, no more than 9” wide with 5” of backspacing with a 37”, E-Rated Tire. 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.

Base Kit Part Number

• New Part# CS-F45-BC-CS-17
• Old Part#   CS-F45-BC20-17

Recommended Rear Lift Options

Although it is possible to order this kit with neither of these options, it is HIGHLY recommended that you do choose one of these options in order for this kit to perform as expected.

• CS-FPAP-45-17 - Progressive Add-a-Pack & Bump Drop
  • Built in the U.S.A. By Deaver Leaf Spring
  • Smooth progressive design
  • Supplied with U-bolts, 2" lift blocks, and hardware
  • Provides 2.5" of lift when factory block is replaced
  • The O.E.M. load capacity is still maintained while improved ride is achieved

• OR

• CS-FFSP-LVL-17 - Full Progressive Leaf Spring Pack
  • Block eliminating, Full Progressive Spring Pack
  • Includes new U-Bolts and Rear Bump Stop Drops
  • Provides a 1", rear high stance on Matching 2.5" Leveling Suspension Systems
  • 35" Tire Fitment