RTS ring and pinion sets are manufactured to meet and exceed OEM specifications that is required for todays modern performance car.r. The design, tooling, steel selection, and heat-treat recipes are all controlled by the RTS Manufacturing factory to produce cost-alternative ring and pinion sets. RTS ring and pinion sets offer exceptional value with better-than-OEM quality. Available in a wide variety of gear ratios for your Modern Holden Commodore or Ford Falcon with M78, M80 ,M86 and ZF Differentials .