You need a GTP PCM (which I am using for the engine swap). I have an HD trans, but that doesn't matter.
Perf Shift is just a set of computer tables that activate and command higher shift points, high line pressure, and skip shifts in aftermarket PCMs.
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'13 Mustang 3.7V6 - MT82
'00 GP SE (L67 Swap, XP, Headers, 3.25")
'98 GTP, '01 Bonne