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I am 99% certain that I want to drop (increase?) from 3.73 to 3.31 in my procharged 2015 GT PP. Only it seems at this point that the selection of 3.31 gears for 2015+ is non-existent. A few articles seem to mention the Ford Performance gears with part number M-4209-88331A (the A being the...

I recently purchased and had installed the base Procharger HO kit for my manual-transmission 2015 Mustang GT. For this install I had the stock Procharger tune applied to the car. The only other modification is a Borla Touring cat-back system. For the most part, the performance far exceeds my...