yes something in the rear suspension is loose, if you want to find it jack up one of the rear wheels get a mallet if you don't have one then a small piece of 2x4, or you can use your fist,wrap the tire kind of hard at the top and also at the side either either front or rear,, if you have movement you have loose suspension,,, mine moved almost 1 inch,, sometime jacket up and looking underneath that you can't find anything wrong but if you can smack the tire and it moves you know you have a problem,, smack it at the top and smack it on the side,, make sure you don't hit the rim. jim