Many miles had been put on the CST kit, some off road, but most on road. We weren't so concerned with parts breaking (we doubted they would), but instead we were more concerned with parts wearing out. Bushings can fail over time, incorrect angles can cause ball joints or tie rod ends to wear out, and even CV shafts can wear if put at improper tolerances. The test truck was put up on the rack at Fabworx and the 35-inch Pro Comp X-Terrains were pulled off to inspect any subtle or obvious wear. Nothing was found out of place or overly worn. In fact, this truck's drivetrain and suspension were masking its age, as everything still looked and felt brand new underneath, save for a little dirt here and there.