KellTrac IRS Subframe Posi-Loc System, Studded (KTI-BUK15RS-S) - 2015–2026 Ford Mustang
The KellTrac IRS Subframe Posi-Loc System is the definitive solution for eliminating unwanted IRS movement in your 2015–2026 Mustang. From the factory, the rear subframe relies on compliant bushings that allow deflection under load—leading to wheel hop, inconsistent handling, and reduced traction. This Posi-Loc system positively locates the IRS subframe in the chassis, dramatically improving stability, control, and driver confidence.
By filling the voids in the factory bushings and applying positive pressure against the OE bushing stops, the KellTrac Posi-Loc system removes deflection without introducing noise, vibration, or harshness. Whether your Mustang is a spirited street car, drag racer, road course machine, or autocross build, this upgrade delivers immediate improvements in feel, traction, and responsiveness.
This studded version goes a step further by replacing the factory IRS mounting bolts with high-strength studs, making installation, adjustment, and future service significantly easier. The result is a rock-solid rear subframe that stays precisely where it belongs—even under heavy wide-open-throttle loads.
Features
- CNC-machined lightweight components for precision fitment
- Constructed from 6061-T6 billet aluminum with black anodized finish
- Industry-first rear lower design that replaces the factory bushing stop plate
- Zero increase in noise, vibration, or harshness
- Stud conversion kit with zinc-coated Grade 10.9 studs, nuts, and washers
- Includes M14x2.0 hand tap and anti-seize for proper installation
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
- Minimizes pinion angle change under heavy load
- Allows subframe height and angle adjustments without risking thread damage
- Makes dropping the IRS subframe easier for frequent servicing or racing use
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
