Under normal operating conditions, CV joints and boots are engineered to last upward of 150,000 miles. Some go the distance, but a lot reach the end of the road far short of their design life. CV joint shafts are typically being replaced at anywhere from 70,000 to 130,000 miles. What's more, some makes and models are notorious for eating shafts, sometimes because of the relatively thin case hardening used in CV joints. Outer CV joints are usually the ones that most often need to be replaced for two reasons. One is that the outer CV joints wear more than the inner CV joints because of the steering angles they experience. The other is that the boots on the outer joints are more apt to fail than the ones on the inner joints.
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