I have the stock 28 spline diff. Can I buy a 31 spline rebuild kit and replace the 28 spline spring with the supplied 31 spline spring, and get some 31 spline moser axles? Or am I stuck buying a 31 spline diff in order to use 31 spline axles? I would think that if I swapped the clutches and disc's from 28 to 31, and use the bigger spring, I could save a few hundred bucks and reuse the stock differential, but I am not entirely sure if that would work or not. Thanks.