Fox Length 28 spline, unless you are installing an Explorer diff with 31 spline. Its a lil more beefy, but if you are using the stock Trak-Lok, 28 spline fox length 79-93.
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Ryan
1990 Mustang GT (In Process)
1993 LX Coupe (Daily Driver, but just choose not to)
2005 Excursion (Big Pig)