The front and rear hubs come complete with CDS’ proprietary line of bushings. Similar to any applications utilizing bushings, you can expect to swap them out periodically. The crankshaft side takes the brunt of the workload by handling most of the vibration absorption, while the supercharger side has double the life expectancy. There’s no set regime on replacement, even so, anytime you disassemble the geardrive, it’s recommended to check the bushings for any distortion. Should you need to replace any of them, they’re extremely affordable and price in at $24 per hub assembly.