SEI New SEI / MerCruiser Alpha One Lower Gear Set (1972–1990) – 1.62:1 Ratio – Counter Rotation – Replaces OEM 812975A5 / 824700A1 MSRP: Was: Now: $591.72 Choose Options
SEI New SEI / MerCruiser Alpha One Upper Gear Set (1972–1990) – 5.7L V8 – 1.47 / 1.50 Ratio – Replaces OEM 43-18410A4 MSRP: Was: Now: $367.28 Choose Options
SEI New SEI / MerCruiser Alpha One Lower Gear Set (1972–1990) – 1.62:1 Ratio – Counter Rotation – Replaces OEM 812975A5 / 824700A1 This SEI Marine Counter-Rotation Lower Gear Set is a precision-engineered replacement for MerCruiser Alpha One sterndrives manufactured from 1972 to 1990. Featuring a 1.62:1 gear ratio, this set... MSRP: Was: Now: $591.72 Choose Options
SEI New SEI / MerCruiser Alpha One Upper Gear Set (1972–1990) – 5.7L V8 – 1.47 / 1.50 Ratio – Replaces OEM 43-18410A4 This SEI Marine Upper Gear Set is engineered as a direct replacement for MerCruiser Type I, R, MR, and Alpha One sterndrives from 1972–1990, designed specifically for 5.7L V8 engines. Featuring... MSRP: Was: Now: $367.28 Choose Options
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