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Product Overview
The new 4.5” / 5.5” Suspension System is just what you need if you're looking for a comprehensive upgrade to your 2017-2024 F250/F350 Truck! This complete kit includes everything you need to give the front of your truck an extra 4.5" / 5.5" ride height increase while maintaining adequate droop travel for a premium ride quality. We kept alignment adjustability in mind with the design of this kit. Our radius arms provide up to 6° of additional caster adjustment.
This kit has been test fit with 37" tires in a few different configurations. The most popular ZERO TRIM combination is a 37"x13.5" BFG KM3 Tire on a 20"x10" -25mm offset, equating to 4.5" backspace. The KM3 has an aggressive tread pattern and fairly chunky sidewall which landed close to the radius arm. Any tire less aggressive than the KM3 will fit with room to spare. If you stick with a 37"x12.5" just about any type of tire will do, and your wheel options open up a bit. If you're keeping the OEM 20” wheels with 5.5" of backspacing, you can squeak by a 37"x12.5" with some minor trimming. If you want to make a 37"x13.5" work, break out the cutting wheel.
You may notice this lift is listed as 4.5" / 5.5", depending on the year. The answer is quite simple, the 2020 and later Ford Super Duty trucks sat 1" lower from the factory than its predecessors. This means the same 4.5" lift coil on a 2005-2019 Super Duty will provide 5.5" of lift on the 2020+ Super Duty. No other parts changed, the truck just started out lower than before. The only time this is not true is for the 2020+ Super Duty TREMOR, these come from the factory with a 2" lift/level, and makes them 1" taller than a stock height 2005-2019. Using our 4.5" / 5.5" spring will lift the front of a 2020+ TREMOR 3.5".
Fits: Ford F-250 / F-350 2017, 2018, 2019, 2020, 2021, 2022, 2023, 2024, 2025
Features:
- Provides 4.5" of Lift 2017-2019 | 5.5" of Lift 2020+
- 4.5" of Lift 2019-2019 | 5.5" of Lift 2020+ | 3.5" of Lift 2020+ TREMOR
- Allows for up to a 37"x13.5" Tire on a 20”x10" -25mm Offset (4.5” Backspace) Wheel
- Compatible with Larger Wheels/Tire with Minor Trimming
- Comprehensive Kit
- Durable Black Finish
- Grade 10.9 Hardware
- Precision CAD Engineering
- Designed for Trucks that Need to Work
- Direct Bolt on Install
- Made in the USA
Includes:
- Fox 2.0 Performance Series Shocks (Front & Rear)
- Radius Arm Kit
- 4.5" / 5.5" Leveling Coils
- Adjustable Track Bar
- 3"-6" Sway Bar End Links
- 2” Lift Rear Block Kit
- Reservoir Mount Kit
- Bump Stop Spacer Kit
- Brake Line Drop Bracket Kit
Kryptonite Part Number KRFD1745FOX
Brand (Manufacturer) Info
We are a privately owned company specializing in American-made steering and suspension components. Our products have been carefully developed and refined over many years to deliver optimal performance and durability. We are committed to providing the highest quality replacement parts and the best customer service in the industry. Our rigorous testing ensures that our parts can withstand the toughest conditions, guaranteeing you the best possible product. We take pride in building our components in the USA. Whether you're seeking reliable replacement parts for your daily commute or high-performance components to withstand the harshness of competition, Kryptonite Steering and Suspension Products are engineered to be the strongest on the market. For years, we've used the Heavy Duty full-sized Duramax Diesel truck platform as our proving ground, subjecting our products to countless miles of research and development. This has resulted in a product line that is renowned for exceptional quality and dependability. No matter if it's for work, play, or competition, you can trust Kryptonite Steering and Suspension Products. We confidently stand behind our products for as long as you own your truck or side-by-side.
