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When the Gt's get to Shelby, Some will arrive with 3.31 rear end's but, All the 3.31 rears get swap out, Completely. To the 3.55 rears. Not a gear change, the shabangy gets change, a complete diff. assy.
Eddy, check your rear differential. Do you get a new sticket or tag on there?
Mine came from ford with that diff in it. When it was at Shelby thier wan no change requiered What ever tag or "Sticket" ?is thier is just going to be what ever designates part # and Ratio.