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OMC King Cobra Gear Ratio Chart

2.3 to 7.5 Liter upper gearcases

  • King Cobra
  • OMC Cobra
  • GMC 2.5 Liter plus drive shaft gear ratio
  • Ford 2.3 Liter plus drive shaft gear ratio
  • Mechanics will find this chart to be an additional tool when working or ordering stern drive parts
  • Exploded View OMC Drawings

GMC 5.7 Litre Cobra before 1988 chart

GMC 5.7 Liter before 1988 chart

Cobra Model King Cobra unit *

Upper
Gearcase

Lower
Gearcase

GMC 2.5 Liter
GMC 3 Liter before 1989

21:18

13:26

GMC 3 Liter since 1989

21:21

14:26

GMC 4.3 Liter

21:19

14:26

GMC 5 Liter

21:17
14:26
GMC 5.7 Liter / before 1988
21:16
14:26

GMC 5.7 Liter after 1988

21:16

14:26

GMC 554 or 502 after 1988

21:17

17:20

Ford 2.3 liter

21:21

13:26
Ford 351 after 1992

21:17

14:26

Ford 5 liter or HQ 5 liter

21:18

14:26

Ford 5.8 Liter

21:16

14:26

Ford 7.5 liter before 1988

21:17

17:30

Ford 7.5 liter after 1988

24:29

17:20

21-16 OMC outdrive with trade-in

21-16 OMC outdrive with trade-in