[Mustang83]

I just had my rear brakes done on my 83 Mustang today. After I picked it up from the Mechanic, I noticed a loud rattle coming from the rear of the car that got worse and worse as I drove it home. I got on the horn to the guy and explained to him the problem....He told me to bring it back down, so I did. He took off the wheel covers and checked the torque on the Lugs which were fine. He then begin to tell me that the problem was the rear axel....He said the guy who put the last set of brake shoes in, had put them in backwards. And by installing the new shoes and drums that it has screwed up my axel. But he then told me that the noise I was hearing was completley normal for "Mustangs" and that they are a crap car....He said I should just ignore the sound and that If I wanted to drive to vegas and back it would be completley safe.....So on the way home the rattle got even worse and then I heard something snap or come lose as I was just pulling into my driveway.....What can the problem be? I would appreciate all your imput...thanks