definate;y check your u joints tho buddy b4 you buy a rearend.jack it up and see if you have anything unusual going on withem.lift up and down ,side 2 side .and you could take five minutes and just pull the shaft and seee how they are .if u have acces to a lift have someone put it in gear wile ure under EASILY put in gear.drive then reverse etc see if the shaft or joints are moving at all .joint are famous for clicking also .its the easiest to hoop for.good luck.