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ok...if you have a GT then you have a posi differential (or as ford calls in a trac lock). All GTs come with em and they are the 8.8 rear end. As for splines, stock is 28.
All sn-95 gt's come with 8.8 rear ends, the 7.5's are in the v6's. They are all 28 spline if stock, and trac locks are garbage on a dd car that will rarely see the strip.