Just on bumps? No noise dependent on wheel speed or anything that would be a bearing? If its just a squeaking over bumps, jack your car up and crawl under there and inspect stuff. You likely goobered something up in the suspension on that side when you smacked the curb. Could be as simple as an isolator, could be something more serious like a broken spring or the shock got knocked out of the bracket on the rear axle or something along those lines.
2000 Mustang GT Steeda build #48. Bolt ons, suspension, Novi 2000.
Just because I give you advice, doesn't mean I know more than you. Its just means I've done more stupid ****.