3 2015 Mustang IRS Upgrades

Though the differential still uses an 8.8-inch gear set, Ford says that dimensional and metallurgical torque-density improvements equate the strength of this unit to a 9.75-inch differential. The diff carrier is iron on manual cars and aluminum on automatic cars. If the so-called Super 8.8 seen here still isn’t enough, The Driveshaft Shop will offer a true 9-inch upgrade.

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