Today I started having strange problems. I'd give it gas and one side would sag, passenger rear? I had a similar problem before x mas and it was an upper control arm. I replaced them and don't "think" that is the problem. My rear end is also a little clanky but I can't notice anything out of the ordinary on inspection. Could someone give me a list of parts I need to beef up my rear? Prices would also be nice. Thanks!