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The only time you would need to replace the springs are when they are under constant stress such as driving with shot/broken struts or the vehicle is always loaded to its limits. In those cases you would want to go with new springs. In those cases most f the times you can notice the deformity in the springs. Otherwise for regular driving cycles where you are not navigating potholes frequently, repalacinng Struts is just fine. Some dedicated suspension shops aalso carry a machine which can test spring compression and bounce back under different loads. You can try that, if you have one in your area,.
 
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