Ok I realized today I shot my whole rear Differential. Everything inside the gear box is busted and I mean everything. I was on Custom RC Cars trying to figure out what items to purchase to get this fixed but I am not sure what a few parts are called. It is hard to find the parts on that site cause not everything has a photo and I am not sure what everyone of the diff parts are called

Also what is the difference between the two of them and which one applies to me, cause I would like all the upgrades