If your Mustang has 60,000+ miles or your having the gears swapped or rebuilt, then this Ford Racing Ring and Pinion Kit should be on your list.
Starting in 2010 Ford changed the inner rear gear pinion bearing in all 8.8" equipped Mustangs. This kit includes the required 2012 Shelby GT500 High-torque pinion bearing.
Note: does not fit 2013 Boss or GT500 with axle codes S-215-D and S-219-D.
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