Huh, @emma_hart, you know that popping sound parkernelson described, have you ever noticed how MUCH worse it gets in colder weather? I had a buddy with a Chevy Silverado that did the exact same thing, and FROZEN roads made that noise ten times louder. The metal gets so brittle when it's below freezing, it's like the spring is just waiting to snap. What really gets me is people think if they can't see rust on the outside, the spring is fine - that's just NOT true. The rust forms INSIDE the coils where the water gets trapped, and by the time you see it on the surface, it's already compromised. That whole "replace both sides" thing parkernelson mentioned is critical, because the other side has been through the exact same wear and tear, just maybe hasn't made itself known yet.