Steeda Mustang Threaded Differential Through Bolt Upgrade Kit (2015-2022)

Steeda Mustang Threaded Differential Through Bolt Upgrade Kit (2015-2022)

Through-bolting the rear Super 8.8" differential to the IRS subframe on S550 Mustangs has become a popular modification due to premature factory bolt failure. Rather than permanently modifying your subframe by drilling out the bushings and differential housing, Steeda designed and machines in-house a custom high-strength hardened bolt that threads completely through the system. After heat treatment, the machined parts are nickel plated to prevent galling and provide superior corrosion protection.

Using heat-treated 4130 chromoly steel, these custom bolts are as strong as a class 12.9 fastener and have been proven on some of the quickest and fastest S550 Mustangs out there, including Steeda's own Silver Bullet build.

Note: Intended to be used in conjunction with Steeda's 555-4050 Hardcore Differential Support Brackets.

Product Benefits:

No permanent modification
Custom designed for this application
Nickel plated to prevent galling
Upgraded hardware over OE
Heat-treated 4130 chromoly for strength similar to grade 12.9 hardware