92 toyota camry back end wobbles or shakes when speed gets up to 55 mph.?

my 92 toyota camry shakes or wobbles in the back end, or rear of the car, but mostly on back passenger side, after i get up to 55 mph. i thought i had a bent rim or maybe a bad tire, so i changed both of those and it still does it. when i hit a bump with both back tires, or the level of the road changes, like pulling into a driveway, it also sounds loose or rattly. not sure what is going on.
 
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