Avoid headaches and replace those pesky failure prone OE or aftermarket diff bushing kits with this KellTrac S550 S650 Mustang Differential Bushing Upgrade Kit. This kit includes everything you need to upgrade your S550's Differential bushings to the best engineered kit on the market! This kit features a proprietary rubber and billet bushing design with high quality 12.9 fasteners sourced from Italy. This kit presses into the stock IRS subrame like stock and the bolts install without any modifications or fabrication required.
*THIS KIT IS A FULL STOCK REPLACEMENT THAT REQUIRES REMOVING THE IRS SUBFRAME ASSEMBLY FOR INSTALLAION*
Kit Includes: (4) 12.9 High Strength Alloy Steel Bolts, (2) Class 12 nuts, (6) HSS Washers, (4) Locking Washers (4) Rubber+Billet Diff Bushings
- 25% more clamp force than next strongest offering
- Industry's strongest bolts, ASTM A574, 170,000psi Tensile Strength
- High Quality, High Strength Class 12 Nuts
- High Quality HSS Zinc Coated Standard AND Locking Washers
- Best Engineered Differential Bushings Available
- Lowest NVH of any full diff bushing replacement kit
- Proprietary Rubber+Billet Bushing Design
- Lifetime Warranty
NOTES:
-Due to factory tolerances, shimming or modifying the diff position within the subframe could be needed. If you have issues please contact us.
-Due to the change in class/grade strength, FRONT BOLTS REQUIRE A TORQUE OF 162ftlbs. (rear torque to 129ftlbs)
-We recommend torquing all fasteners with a "dab" of name branded Blue Loc-Tite.
-Bushings press "outside in" like factory - billet machined faces contact differential mounting ears
-All bolts install "outside in" - largest silver washers and bolt heads are all outboard side of IRS subframe and bushings
*Long bolts install on front mounts / Shorter bolts install on rear mounts
**Ensure that arrows on front flange side face left to right when installing bushings. DO NOT INSTALL WITH ARROWS IN ANY OTHER ORIENTATION.
***RACECARS SHOULD USE OUR BIG BERTHA BOLT KIT THAT IS SPECIFIC FOR THIS SYSTEM***
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
CA Residents: WARNING: Cancer and Reproductive Harm www.P65Warnings.ca.gov
