• 15+ Years of Performance Parts, Tuning & Installation
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Skyjacker COM BOX4.5-6In 21 F150 4WD

  • Backed by real installs and tuning experience at FAST of West Chester
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$1,327.85
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Exacting engineered CNC machined ductile iron replacement steering knuckles preserve the OEM track width and maintain proper steering geometry through the travel cycle. Skyjacker's unique rear crossmember incorporates the driver side sway bar drop bracket for strength and stability. Coupled with a passenger side sway bar drop bracket, the OEM sway bar operates at optimum angles. The pair of sturdy front and rear crossmembers provides a solid mounting point for the OEM lower control arms. Three separate differential relocation brackets reposition and correct front CV axles and driveshaft angles. Every metal fabricated bracket is precise CNC laser cut and precision formed in CNC press break, there is expert workmanship in every component of the kit. Powder coated to provide an extremely durable protective barrier to prevent corrosion.

Installation Instructions
  • No Cutting No Grinding Of Front Differential Housing Required
  • Differential Brackets Lower And Correct Front Driveshaft Angle
  • Works Properly with Electronic Stability Control [ESC] System
  • Aggressive Look / Unparalleled Performance / Impressive Ride
  • CNC Machined Ductile Iron Knuckles Preserve Oem Track Width
  • Three Separate Diff Brackets Reposition Correct CV Angles
  • Precision Engineered To Maintain Proper Suspension Geometry
  • Enjoy Enhanced Attitude And Increased Suspension Clearance
  • Front And Rear Crossmembers Properly Reposition LCA Mount
  • Prevents CV Axle Overextension Within The OEM Tolerances
  • Knuckles Keep Same Steering Geometry And Turning Radius
  • Modern Exacting CNC Laser Cut / Bends And Machining

This Part Fits:

Year Make Model Submodel
2021-2022 Ford F-150 King Ranch
2021-2022 Ford F-150 Lariat
2021-2022 Ford F-150 Limited
2021-2022 Ford F-150 Platinum
2021-2022 Ford F-150 Police Responder
2021-2022 Ford F-150 SSV
2021-2022 Ford F-150 XL
2021-2022 Ford F-150 XLT
  • Earn FAST points on this part!
  • Backed by real-world installs
  • FAST WC Team Approved
Skyjacker COM BOX4.5-6In 21 F150 4WD

$1,327.85

Why Drivers Choose FAST of West Chester

  • I can't recommend this place enough. Being able to trust a shop in the performance world is big. The 2hr drive to get there, is worth knowing the job will be done right. Very happy to have found this shop, to
    support my builds going forward.

    Donald Wojnar

  • I recently had the pleasure of working with FAST of West Chester for some performance upgrades on my 2022 WRX, and the experience was nothing short of exceptional. I opted for a Borla S-Type exhaust and Cygnus Coilovers, and the team at FAST nailed the installation, fitment, and setup to a T.

    Adam Cranston

  • The team at FAST are excellence in every way. First, I consulted with Dave on mods for my HPDE track car. He listened and advised me on the best parts & mods to achieve my goals. He was patient & gave me space to research the options presented & worked with me through several changes before we built. Second, the build execution was flawless, proper heat shielding, bracing and poly everywhere. All components worked as advertised.

    Bryce Budd

  • This place has been my go to shop for all things Subaru. From simple service to performance parts and tuning, they have been top notch.

    William Brunell

  • Excellent shop. They installed a Cobb Stage 2 DP and Whiteline Sway bars and end links on my 2013 WRX. The work was done right and clean. The estimate was accurate. They were very knowledgeable, friendly and gave me the straight scoop on exactly what I was getting for the money
    and what I needed to get where I want to be with it. I'd recommend them
    to any car enthusiast.

    Devin Greco

Does it come with a warranty?

Most products we carry include a manufacturer warranty. Since we work with top performance brands, warranty coverage can vary by product. If you have questions about a specific item, reach out — we’re happy to help.

Do you offer installation help or advice?

Yes — we don’t just sell parts, we install and tune them too. FAST of West Chester is a real performance shop, and we’ve worked hands-on with many of the products we carry. If you have questions about fitment, installs, or building your setup, our team can point you in the right direction.

How fast is shipping?

Many of our products ship the same day or next business day, depending on availability. We work hard to get parts out fast so you can get your build moving without delays.

What’s your return policy?

Returns for exchange or refund are accepted within 30 days of receiving your order. Items must be in new, unused condition and in original packaging. If you have any questions, our team will help make the process easy.

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