S550 Mustang IRS Bushing Upgrade Kit, Level 2

This Level 2 KellTrac S550 Mustang IRS Bushing Upgrade Kit for the S550 Mustang positively locates the rear IRS Subframe, Differential, Knuckles AND the rear lower control arms within the chassis. By filling the voids within the factory bushings on the Subframe Mounts and putting positive pressure on the factory bushing stops, the PosiLoc kit eliminates the deflection found within the stock assembly that leads to poor performance in all scenarios. By completely removing the sloppy rubber in the factory front Lower Control Arm bushing, the Spherical Bearing kit positively and precisely locate the rear axle knuckle assemblies within the chassis. These Lower Control Arm Bearings are made from only the best materials. The factory rubber bushings, or even aftermarket polyurethane bushings deflect under heavy loads - these bearings eliminate that deflection that leads to poor performance in all scenarios. The Monoball knuckle to toe-link bushings replace the factory sloppy and crack prone bushings for precise control and less erratic toe alignment change under loads, and our industry unique differential bushings enable controlled movement of the rear differential assembly. With our Level 2 kit we provide front centering sleeves to complete the squareness of the IRS Subframe when mounting to the vehicle. Whether you are a spiritedly street cruising, drag racing, road racing or auto-crossing this Level 2 KellTrac Bushing Upgrade Kit will significantly improve the performance and feel of your S550 Mustang.

FEATURES: KellTrac Posi-Loc

-CNC Machined Lightweight Design

-6061-T6 Billet Aluminum, Anodized Black

-Precision fitment for maximized performance

-Zero NoiseVibrationHarshness Increase

-Industry First Unique rear lower design, replaces factory bushing stop plate

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FEATURES: Rear Control Arm Bearing Kit

-Most Proven S550 LCA Bearings

-Super Strong CNC Machined Steel Body

-Most durable coating in the industry

-6061-T6 Billet Aluminum Bearing Offset Spacers

-Proprietary to BMR 1" Spherical Bearings

-Precision fitment for maximized performance

-Minimal NoiseVibrationHarshness Increase. HIGHLY Recommended for performance applications

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FEATURES: Polyurethane Centering Sleeves

-Extremely Lightweight Design

-Precision fitment for maximized performance

-Zero NoiseVibrationHarshness Increase

-Industry First Unique Polyurethane Design

*Installs into front bushing centers

FEATURES: Monoball Toe Bushing Kit

-OEM Designed, Engineered and Manufactured

-Precision fitment for maximized performance

-Spherical Monoball for low deflection compared to stock rubber

-Monoball significantly outlasts OE Rubber

-Zero NoiseVibrationHarshness Increase

-Reduces erratic toe-change / Lessens Wheel-Hop

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FEATURES: Differential Bushing Upgrade Kit

-OEM Designed, Engineered and Manufactured

-Precision fitment for maximized performance

-Higher quality, higher durometer rubber for increased performance

-Significantly outlasts OE Rubber design (especially rear driver side cracking)

-Minimal NoiseVibrationHarshness Increase

-Reduces erratic diff movement / Lessens driveline damage

-Lowest NVH of any full diff bushing replacement kit

-Proprietary Rubber+Billet Bushing Design

-Lifetime Warranty

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BENEFITS:

-Reduces Wheel-Hop

-Centers Subframe to Chassis

-Improves Handling, Traction and Feel

-Helps prevent bushing and driveline part damage

-Can assist in reducing driveline vibrations

-Reduces pinion angle change under heavy WOT loads

-Reduces unwanted suspension geometry and alignment change under heavy loads

2015 Mustang GT

Recently installed a 3.73 differential along with Kelltrac’s level 2 kit and I gotta say I’m glad I did the car handles like a beast! A+++++

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Reviewed by: Billy Bomba from Port Charlotte,Florida. on 9/7/2025

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