Yes, the Male bullet connectors go bad after about 2 months. I replace them every month.
I run the 8xl. I run in very high stress enviroments. The mud i run in is basically the same substance as quick sand. So I bought the 8xl to be sure it can handle my weight, and handle my enviroment. Fortunatly i fine tuned my truck so it doesn't pop wheelies.
I run the Unlimited Engineering Ultalite differential. They lower the overall ratio. The Stock ratio is 2.85:1 and the ue diff is 3.31:1.

I plan on gearing for speed, what do you think i should use?