Kryptonite KRFC45 4.5 inch Dual Rate Coil Springs | 2005-2024 Ford F250/F350 Super Duty Powerstroke 4WD

Features:

• Compatible with 2005-2024 Powerstroke 4WD models
• Provides 4.5-5.5 inches of front lift
• Dual-rate design balances comfort and strength
• Engineered for heavy-duty load handling
• Maintains plush ride with minimal spring sag
• Ideal for towing, hauling, and off-road use
• Built with premium high-strength spring material
• Direct fit install with no modifications needed
• Sold as a pair of front coil springs only
• Not recommended for gas engine applications
• Covered by Kryptonite's No Fine Print warranty
• Made to endure extreme conditions and hard use

Built To Handle Whatever You Throw At It

If you're lifting your Super Duty and want coil springs that don’t just look good but actually perform under pressure, the Kryptonite KRFC45 4.5" Dual Rate Coil Springs are exactly what your truck needs. These springs were built for the kind of drivers who don’t baby their rigs, whether you're towing, off-roading, or just racking up highway miles, they’re made to hold up. The dual rate design gives you the best of both worlds: a smooth, comfortable ride for daily driving and serious strength when the load gets heavy. Whether you're running a 2005 or a 2024 Powerstroke, these springs will give your front end the lift and support it needs without sagging or losing shape over time. Kryptonite put these springs through years of real-world testing and it shows in every mile you drive. They’re sold as a pair and backed by the company’s famous no-nonsense lifetime warranty, so you can drive hard and worry less. If you're chasing performance, comfort, and durability in one package, these coils bring it all to the table.

Designed For Consistent Ride Height And Long Life

The Kryptonite KRFC45 coil springs are a true dual rate design, which means they use two distinct spring rates to balance comfort and control. The softer initial rate allows for smoother ride quality on light-duty roads, while the stiffer second stage handles heavy loads and uneven terrain with confidence. These springs are built using premium-grade materials that resist sag and fatigue, even after years of hauling or off-road abuse. They’re designed for 2005–2024 Ford F250 and F350 Super Duty trucks equipped with 6.0L, 6.4L, or 6.7L Powerstroke diesel engines. Depending on the model year, you’ll see around 4.5 to 5.5 inches of lift due to changes in stock ride height. Installation is straightforward with no cutting or welding required, and they bolt right into place using your truck’s existing hardware. Kryptonite also engineered these coils to deliver reliable front-end support under added weight like bumpers or winches. It’s a smart suspension upgrade for any Powerstroke owner who values longevity, strength, and consistent ride quality.

Fits: 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022, 2023, 2024 Ford F250/F350 Super Duty Powerstroke 4WD

Notes:

• Fits 2005-2024 Ford F250/F350 4WD Powerstroke diesel only
• Not recommended for gas engine models due to stiffness
• Provides 4.5" lift on 2005-2019 trucks
• Provides 5.5" lift on 2020-2024 trucks
• Adds 2.5" lift to 2020+ Tremor models with factory front lift
• Sold as a pair of coil springs only
• This is not a complete lift kit
• Direct fit with no cutting or modifications required
• Designed for heavy hauling and off-road durability
• Covered by Kryptonite's lifetime No Fine Print warranty
• Must be purchased from an authorized dealer for warranty coverage
• Warranty registration required within 90 days of purchase