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Up for sale are an Eaton 31 spline posi member with matching superior 31 spline axle. If u buy the eaton and axle i can sell you an older production ford racing ring and pinion...your choice of 3.73 or 4.10 for a 100. I was told that the older ring and pinion made by ford racing were made much better. All parts are brand new and will fit sn95. Eaton posi and axle 550 ring and pinion 100. Thanks for looking.