There's 28 splines on a stock axle I believe and yes if you're going to do some serious racing, you would want to move up to 31 for more strength. More splines the stronger.
James
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90' Mustang GT Convertible-
C4 w/ manual body
4.10's soon to be 3.27's
2 Ch Flowmasters
1/8th ET 9.04
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