That's one theory. Some "experts" claim that springs almost never sag or fail - was that Stu Ritter? Can't remember. However that defies laws of physics, spring steel does change in rate over time & usage (doesn't it?). And I have heard of a lot of people who put new springs in their cars (due to sagging) and been happy with the increase in ride height. Probably wouldn't hurt, new rear springs will be $200/pair.
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