OMC Parts / OMC Cobra Stern Drive Tech Drawings

OMC Electric Shift Gear Ratio Chart 1973-1977

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OMC stern drive gear ratios years 1973 thru 1977

  • Upper / lower gear case
  • OMC electric shift outdrives 1972 thru 1977 have 15 / 23 lower gear ratios
  • Click here for used omc outdrive parts
    omc_electric_shift_1971_to_1977_1.jpg
    1973 thru 1977 omc stern drive ( electric shift lower unit )

    OMC Stern Drive Year

    HP

    Upper gear case

    1973
    100 hp
    16 / 20 Upper
    1973
    120 hp
    16 / 20 Upper
    1973
    140 hp
    19 / 20 Upper
    1973
    165 hp
    21 / 19 Upper
    1973
    225 hp
    21 / 16 Upper
    1973
    245 hp
    21 / 16 Upper
    1974
    120 hp
    16 / 20 Upper
    1974
    140 hp
    19 / 20 Upper
    1974
    165 hp
    21 / 19 Upper
    1974
    170 hp
    21 / 19 Upper
    1974
    190 hp
    21 / 19 Upper
    1974
    225 hp
    21 / 16 Upper
    1974
    245 hp
    21 / 16 Upper
    1975
    120 hp
    16 / 20 Upper
    1975
    140 hp
    19 / 20 Upper
    1975
    165 hp
    21 / 19 Upper
    1975
    175 hp
    21 / 19 Upper
    1975
    190 hp
    21 / 19 Upper
    1975
    225 hp
    21 / 16 Upper
    1975
    235 hp
    21 / 16 Upper
    1975
    245 hp
    21 / 16 Upper
    1976
    120 hp
    16 / 20 Upper
    1976
    140 hp
    19 / 20 Upper
    1976
    165 hp
    21 / 19 Upper
    1976
    175 hp
    21 / 19 Upper
    1976
    190 hp
    21 / 19 Upper
    1976
    225 hp
    21 / 16 Upper
    1976
    235 hp
    21 / 16 Upper
    1977
    120 hp
    16 / 20 Upper
    1977
    140 hp
    19 / 20 Upper
    1977
    175 hp
    21 / 19 Upper
    1977
    190 hp
    21 / 19 Upper
    1977
    235 hp
    21 / 16 Upper