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Also fits the 90-95 Cosmo 20B engines.
Can be used to upgrade any 1974-1989 13B engine to hardened gears with multi-window bearings for increased oil flow. These gears come hardened from the factory.
Includes main gear bearing and rear main seal, both installed.
You can no longer get these from Mazda, if you order one you will receive a modified high power Rx8 rear gear. They are hardened like the 93-95 Rx7 gears.
We have machined a groove into the gear so that it works with 93-95 Rx7 rear side housings.