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
  • Complete rebuilt gear case available

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