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- OEM Mercruiser / Alpha 1 rebuilt upper gear cases available for
all models
- Does not include yoke drive shaft, socket or u-joints
- Available gear ratios: 1.50 or 1.47 (20 / 22) most V8 under 300 hp, 1.65
(24 / 24) 6 cylinder inline, 1.84 or 1.81 (17 / 19) V6 and 470 / 485, 1.98 or 1.94 (20 /
24) 4 cylinder inline
- OEM: 1547-9421A2,
1547-9412A21, 1547-9412A22, 1547-9412A23
- For new aftermarket units, see our Mercruiser lower unit gear case page
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