I was on ebay. Whats is the daytona pinion support? Why is it better than stock and what are the differences? Also, I keep seeing 28 and 31 spline when referencing to 9" axles. How do you know what you have and which goes where? Lastly, I keep seeing mention of big bearing. Once again how do you know which you have? Im wondering this because I have a seal leaking slightly, and when I tear it down, I'm going replace axles, go to 4.11's bearings and all that shit. Thanks in advance!!