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OMC Gear Ratio Chart Electric Shift 1973-1977

Upper / lower gear case OMC electric shift outdrives 1972 to 1977 have 15 / 23 lower gear ratios Exploded View OMC Drawings Search by part number or description here Complete rebuilt gear case available

Stern Drive Year	HP	Upper gear case
1972 to 1977	100, 120 hp	16 / 20 Upper
1973 to 1977	140 hp	19 / 20 Upper
1973	165 hp	21/19 Upper
1973	225, 245 hp	21/16 Upper
1974	165, 170, 190 hp	21/19 Upper
1974	225, 245 hp	21/16 Upper
1975	165, 175, 190 hp	21/19 Upper
1975	225, 235, 245 hp	21/16 Upper
1976, 1977	165, 175, 190 hp	21/19 Upper
1976, 1977	225,235 hp	21/16 Upper

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