Drake Muscle Cars cast-aluminum Differential Girdle features beefy construction to help keep your rear axle housing from distorting. Features load bolts to keep the main differential caps from walking or distorting, a fill plug to save from the hassle of having to fill from the front of the rear axle housing, and a magnetic drain plug. Includes all necessary hardware to install except gasket. Note: Not for Mustangs with IRS and does not fit 2012+ Boss 302 or gear sets higher than 4.11.