So is it a 28 spline or a 31 spline? Im considering buying a new diff along with 4 10 gears after 160k miles of stock gear in the rear, but im not sure on what brand makes a good product and what spline axel to buy for. Anything else to consider buying while im back there? Im not looking for the Rolls Royce quality but just something great for a DD and track use once or twice a year. Thanks