RTS M78 Differential Kit ,Gear Ring and Pinion, 31spl Mini Spool, 3.90:1, Holden

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RTS' ring and pinion sets and mini spool kits are manufactured to meet and exceed OEM specifications that are required for todays performance cars. 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. Available in a wide variety of gear ratios for your modern Holden Commodore or Ford Falcon.