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OMC Gear Ratio Chart Electric Shift 1973-1977

Stern drive gear ratios years 1973 to 1977

  • Upper / lower gear case
  • OMC electric shift outdrives 1972 to 1977 have 15 / 23 lower gear ratios
  • Complete rebuilt gear case available

Exploded View OMC Drawings
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electric shift 1971 to 1977

electric shift 1971 to 1977

Stern Drive Year

HP

Upper gear case

1973 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