A decent-quality set of aftermarket ball joints will stay in a perfect shape for at least 100K miles. The best sets will even serve for up to 150K miles. So, don’t go cheap on this one and only buy joints from well-known and trusted brands. This is important: if you’ve noticed that only one of your joints is acting up, and the rest are doing fine, don’t just replace that one joint. Misalignment is a known issue, and you can avoid it if you go ahead and replace all four.