Really bro.....do a lil...and I mean a lil search. You will see that in corolation to geagraphical location, Coleim from this forum is the best you will get....PERIOD, and I will put my dollars on that. All your questions (be it noob, or advanced) will be addressed, and explained. The Thud is not normal. If u got a new car today, that sound would never be considered (Normal). HERE is the difference....normal-no, tolerable for a while a while without breakin ****-yes, how long for.....dont chance it. After a while, you WILL have drivetrain issues, tranny issue, or a plethra of other problems. IF YOU HAVE THER THUD CHANGE YOUR DIFF BUSHINGS. If u need to ask what bushing...get them all, if you dont, then get the 1 you already know you need, and stop tryin to convince yourself it will fix its self, or its something else.