a few problems im not sure about

#1, there is a vibrating from the car that peaks at 50 mph and goes away about 73mph. I know its coming from the back, and I think the back left. When I had it up on a jack and ran it, I noticed the wheel making significant movement left to right looking at the back of the car. Could this be the cause of the noise? Its not a solid vibration, but a vrmmmm...vrmmm....vrmmmmmm, pulsating about every 2 seconds. It drive me nuts cause it makes the trim pieces around the c4 shifter squeek. My dad has he thinks its a wheel bearing going out.

#2, the car leans. Looking it at from the back it leans alot to the right. its alot cause everyone notices it and asks whats wrong with it. And if I had to say, it leans to the back, trying to pinpoint an area here for ya. Is it a going out shock, weak spring, etc???

Thanks

well, the springs are probably 15 years old, course they could be the originals huh???

should i try putting the spare on and seeing if that fixes it? its not likely that both wheels are bent eh?