#9X. C4 Six Pinion Planetary. The forward planetary gear set has proven to be the weak link in high performance applications running C4 transmissions. The strength of the C4 forward planetary has become an issue with the ever increasing loads that racers are subjecting this transmission to. With this new six pinion planetary, the load capacity is doubled! We have also added roller bearings to each planet that reduces friction and parasitic loss. Includes planet gear only.