Is there any reason one couldnt use a 8.8 31 spline diff out of a ford truck or suv to put in a cobra? The reason I ask is I need to change my rear gears and was planning on upgrading the entire rear later anyway so I figure this could be a cheap option to get the ball rolling. These diffs can be picked up super cheap and then all I should need is a set of 31 spline axles. Ive seen these diffs with gears go for the price of just replacing the gears and I may even be able to score one off my buddy for free.