Thanks for the info! And while I will say that I'm not an "aggressive" driver, buuuut I don't always obey the speed limit lol I try to take care of my car because I do love it and want to keep it in good shape as long as possible, so I try not to go too crazy.

The mechanic also showed me under my car, he grabbed the transaxle and was moving it around, like wiggling it, and he said "That's not supposed to do that." Is that true? And if it is true, would a broken differential and casing cause it or could it be something else?