KellTrac IRS Subframe Posi-Loc System (KTI-BUK15RS) - 2015–2026 Ford Mustang
The KellTrac IRS Subframe Posi-Loc System is a precision-engineered solution for eliminating unwanted rear subframe movement in 2015–2026 S550 and S650 Mustangs. From the factory, the IRS subframe relies on compliant rubber bushings that allow deflection under load—resulting in wheel hop, inconsistent handling, and reduced traction. The Posi-Loc system addresses this issue at its source.
By filling the voids within the factory subframe bushings and applying positive pressure against the OE bushing stops, the KellTrac Posi-Loc system firmly locates the IRS subframe in the chassis without increasing noise, vibration, or harshness. The result is a noticeably more planted rear end with improved feedback and confidence, whether you’re street driving, drag racing, road racing, or autocrossing.
Designed for enthusiasts who want meaningful performance gains without sacrificing drivability, this system delivers improved control, stability, and long-term durability—all while retaining factory bushings and eliminating the need for centering sleeves.
Features
- CNC-machined lightweight components for precise fitment
- Constructed from 6061-T6 billet aluminum with black anodized finish
- Precision-engineered to maximize IRS subframe control
- Industry-first rear lower design that replaces the factory bushing stop plate
- Zero increase in noise, vibration, or harshness
Benefits
- Positively locates and centers the IRS subframe to the chassis
- Reduces wheel hop and improves traction
- No centering sleeves required
- Improves handling response and overall vehicle feel
- Helps prevent premature bushing and driveline component damage
- Can assist in reducing driveline vibrations
- Reduces pinion angle change under heavy wide-open-throttle loads
Fitment
- 2015 Ford Mustang
- 2016 Ford Mustang
- 2017 Ford Mustang
- 2018 Ford Mustang
- 2019 Ford Mustang
- 2020 Ford Mustang
- 2021 Ford Mustang
- 2022 Ford Mustang
- 2023 Ford Mustang
- 2024 Ford Mustang
- 2025 Ford Mustang
- 2026 Ford Mustang
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!
CA Residents: WARNING: Cancer and Reproductive Harm www.P65Warnings.ca.gov
