OMC Parts / OMC Cobra Stern Drive Tech Drawings

OMC King Cobra Gear Chart
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1978 thru 1985 new lower unit
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Suggested items for OMC Cobra lower unit repair
1978 thru 1986 Tilt motor
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400 800 Stringer seal kits upper gearcase
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400 / 800 Upper gearcase drawing
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800 Repair cost lower gearcase
1986 thru 1992 Components Lower Gearcase
1986 thru 1992 Gears Upper Gearcase
1985 thru 1995 Serial / Model Number
1978 to 1981 Hydraulic Assist Gear Ratio Chart
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1982 to 1986 Gear Ratio Chart
1986 thru 1992 Gears Lower Gearcase Chart / Shafts
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Stern drive troubleshooting starts with carburetor
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Drive shafts 400 800 and stringer
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OMC King Cobra Gear Chart

GMC 5.7 Litre Cobra / King Cobra before 1988
21-16-OMC-outdrive-with-trade-in.jpg
21-16 OMC outdrive

Long Yoke Drive Shaft Gear Ratios

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

OMC Cobra Model
OMC King Cobra *
Upper Gear Case
Lower Gear Case
GMC 2.5 Litre
21:18
13:26
GMC 3 Litre before 1989
21:18
13:26
GMC 3 Litre since 1989
21:21
14:26
GMC 4.3 Litre
21:19
14:26
GMC 5 Litre
21:17
14:26
GMC 5.7 Litre Cobra / King Cobra before 1988
21:16
14:26
GMC 5.7 Litre Cobra / King Cobra after 1988
24:29
17:21
GMC 554 or 502 King Cobra after 1988
21:17
17:20
Ford 2.3 Litre
21:21
13:26
Ford 351 King Cobra after 1992
24:29
17:21
Ford 5 Litre or HQ 5 Litre
21:18
14:26
Ford 5.8 Litre
21:16
14:26
Ford 7.5 Litre King Cobra before 1988
21:17
17:30
Ford 7.5 Litre King Cobra after 1988
24:29
17:20

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