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If you're looking for a robust upgrade to the rear axle and bearings on your C4, you may want to consider this kit that allows the use of the SKF X-Tracker wheel bearing on the rear of the C4. This bearing is is a significant improvement over the stock bearing and requires the use of a 30 spline spindle which is also included in the kit. The full kit description can be found on this thread.
For Sale - C4 REAR AXLE X-TRACKER HUB/SPINDLE ADAPTER KIT
For Sale - C4 REAR AXLE X-TRACKER HUB/SPINDLE ADAPTER KIT