You'll need a 31 spline differential with the 31 spline axles. Like Chris said, the 31 splines have a larger diameter, it's not just the # of splines. You can get a 31 spline Trac Lok unit out of an F-150 I believe and pick up a set of Moser or Superior axles. You don't need to go with c-clip eliminators unless you have a dedicated drag car that goes 10.99's or faster, my experience has been that they are not very compatible with street cars.
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