So I bent my snubber bar over the yoke on my challenger. It made one hell of a racket, at first I thought I broke something in the rear end. I would like to say the reason it did that was too much power! haha, anyways my question is what else can cause this? This was on the street with street tires.

The cause ? .... a combo of weak springs and bad shocks.

Yeah I was thinking shocks. So I have stock springs but can they wear out or do they?

Yes they can and do lose their stiffness.