KellTrac 4/8 Adjustable Lowering Kit w/ Bearings, RACE Series (KTI-15F150-48-R) - 2015-2026 Ford F-150
Improve the stance, handling, and traction of your 2015-2026 Ford F-150 with the KellTrac RACE Series Adjustable 4/8 Lowering Kit. Developed for enthusiasts seeking improved suspension performance and extensive adjustability, this kit combines ride-height-adjustable front coilovers, triple-adjustable rear Viking shocks, and a rear leaf spring flip kit to deliver an aggressive lowered stance with performance-focused suspension control.
After more than a year of development and testing, KellTrac engineered this system to provide increased front shock travel, adjustable suspension damping, and application-specific shock valving designed for the F-150's leaf spring suspension. The RACE Series features spherical bearing front and rear mounts for precise suspension movement, making it an excellent choice for enthusiasts focused on street performance, prepared drag strips, and no-prep racing.
Adjustable 4/8 Lowering System
The KellTrac RACE Series is designed to provide a 4/8 lowered stance while allowing drivers to fine-tune suspension height and performance.
The front ride-height-adjustable coilover system features conversion mounts with adjustable shock positioning, providing increased front shock travel compared to other lowering options.
At the rear, the included leaf spring flip kit provides the lowered ride height while retaining the truck's leaf spring suspension configuration.
Double-Adjustable Front Viking Coilovers
The front suspension utilizes a ride-height-adjustable, double-adjustable coilover system with custom Landrum springs specified for the application.
Adjustable compression and rebound damping allow drivers to fine-tune front suspension movement for different driving and racing conditions.
The included front coilover conversion mounts provide adjustable shock positioning, allowing additional flexibility when setting up the suspension.
Triple-Adjustable Rear Viking CRUSADER Shocks
The rear suspension features KellTrac-specific triple-adjustable Viking shocks with CRUSADER valving, stroke, and construction developed for the F-150's leaf spring suspension.
The triple-adjustable design provides extensive suspension tuning capability, allowing drivers to adjust rear suspension response for different track surfaces and traction conditions.
These shocks retain the factory rear mounting locations and include Bilstein high-density foam shock bumpstops and Monroe shock dust boots as standard equipment.
Spherical Bearing Suspension Mounts
The KellTrac RACE Series is specified with spherical bearing front and rear mounts for precise suspension articulation and performance-focused suspension control.
Spherical bearings help minimize bushing deflection, allowing suspension components to respond more directly to changes in load and track conditions.
This bearing-based configuration is intended for drivers who prioritize suspension precision and adjustability in performance applications.
Rear Leaf Spring Flip Kit and Driveline Correction
The included rear leaf spring flip kit provides the rear lowering components required for the 4/8 suspension configuration.
A rear pinion angle correction kit is included to help address driveline geometry changes associated with lowering the truck.
The kit also includes a transmission shim kit for use when necessary, extremely low-profile rear bumpstops, and new rear leaf spring mounting hardware.
Adjustable Front Camber Correction
A front control arm adjustable camber kit is included to assist with alignment after lowering the truck.
KellTrac notes that maximum front camber adjustment averages approximately -2.00 degrees. Achieving less negative camber may require additional adjustable upper control arms or modification of the mounting holes.
Street and Drag Strip Suspension Performance
The KellTrac RACE Series was designed and tested specifically for street and drag strip applications, including prepared and no-prep racing surfaces.
Its adjustable Viking shock valving and custom Landrum springs allow drivers to fine-tune suspension response for varying traction conditions.
The combination of increased front suspension travel, triple-adjustable rear shocks, and spherical bearing mounts is designed to improve handling, traction, and overall suspension feel.
Kit Includes
- Front ride-height-adjustable, double-adjustable coilover system
- Front coilover conversion mounts with adjustable shock positioning
- Front control arm adjustable camber kit
- Rear stock-location KellTrac triple-adjustable Viking shocks
- Bilstein high-density foam shock bumpstops
- Monroe shock dust boots
- Rear leaf spring flip kit
- Rear pinion angle correction kit
- Transmission shim kit for use when necessary
- Extremely low-profile rear bumpstops
- New rear leaf spring mounting hardware
- Required installation components and hardware
Features
- Designed for 2015-2026 Ford F-150 applications
- RACE Series adjustable 4/8 lowering kit
- Developed and tested specifically for street and drag strip applications
- More than one year of suspension development and testing
- Developed through innovation involving KellTrac, Viking Performance, and UMI Performance
- Front ride-height-adjustable, double-adjustable coilover system
- Rear triple-adjustable Viking shocks
- KellTrac-specific Viking CRUSADER shock valving, stroke, and design
- Custom Landrum springs specified for the application
- Adjustable compression and rebound damping
- Increased front suspension travel compared to other lowering options
- Adjustable front coilover shock positioning
- High-quality spherical bearing front coilover mounts
- Spherical bearing rear mounts for precise suspension movement
- Rear shocks retain factory mounting locations
- Shock valving developed for leaf spring suspension performance
- Lightweight CNC-machined components
- Designed to improve traction on a variety of racing surfaces
- Adjustability for prepared and no-prep drag racing conditions
- Allows ride quality and suspension performance adjustments
- Designed to improve handling, traction, and suspension feel
- Front adjustable camber correction kit included
- Rear leaf spring flip kit included
- Rear pinion angle correction components included
- Transmission shim kit included for use when necessary
- Bilstein high-density foam shock bumpstops included
- Monroe shock dust boots included
- Extremely low-profile rear bumpstops included
- Precision-fit components designed for consistent performance
- Assembled in-house and ready for installation
- Estimated installation time of 3-5 hours
- All required installation components included
Fitment
- 2015 Ford F-150
- 2016 Ford F-150
- 2017 Ford F-150
- 2018 Ford F-150
- 2019 Ford F-150
- 2020 Ford F-150
- 2021 Ford F-150
- 2022 Ford F-150
- 2023 Ford F-150
- 2024 Ford F-150
- 2025 Ford F-150
- 2026 Ford F-150
Important Fitment and Installation Notes
Towing Restriction: This lowering kit was not designed for towing applications.
Frame Modification: Frame notching may be required in some applications to provide adequate suspension clearance.
Camber Adjustment: Maximum front camber adjustment averages approximately -2.00 degrees. If less negative camber is desired, adjustable upper control arms or slotting the mounting holes may be necessary.
Ride Height: The front coilover system is ride-height adjustable, allowing the suspension to be configured to suit individual lowering goals within its adjustment range.
Intended Use: Designed and tested only for street and drag strip applications, including prepared and no-prep racing surfaces.
Installation: KellTrac estimates a 3-5 hour installation. All required installation components are included. Additional frame modifications or alignment components may be necessary depending on the application.
Vehicle Configuration: Confirm drivetrain, cab configuration, and any application-specific restrictions with KellTrac before ordering, as the supplied fitment information does not specify these details.
Kelltrac Terms Of Service
Kelly considers his Kelltrac line to be a specialty line for a unique customer base and has his own terms of service in addition to Beefcake Racing's. You must accept these terms on all Kelltrac orders. Please read shipping times, cancellation, and returns. If time is of the essence, we do have other options that can ship right away / quicker. Just reach out to one of our sales associates at Beefcake Racing.
Cancellations & Returns
KellTrac Innovations does not accept product returns. Once your order ships, you own it and we will not accept it back - NO EXCEPTIONS. We do not accept order cancellations after the product has shipped. If you understand and accept this please check the box and continue checking out. If you do not accept this, please stop and discontinue the order process. Thanks!
Due to the custom nature of our business and product offerings, we charge a 20% order cancellation fee, period, non-negotiable, no matter who you are. Orders can only be cancelled before the product ships. We do not accept order cancellations after the product has shipped. If you understand and accept this please check the box and continue checking out. If you do not accept this, please stop and discontinue the order process. Thanks!
Leadtime
Please be aware that most orders ship within 2-4 weeks. In some (rare) cases, orders can take up to 6-8 weeks to ship. Holidays can severely impact these lead times. *DO NOT CONTACT US ABOUT YOUR ORDER UNLESS IT IS OLDER THAN 20 BUSINESS DAYS!* If you understand and accept this please check the box and continue checking out. If you do not accept this, please stop and discontinue the order process. Thanks!
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