OMC Parts / OMC Cobra Stern Drive Tech Drawings

OMC Cobra lower unit gearcase replacement
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1978 thru 1985 new lower unit
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1986 thru 1993 New upper gearcase assemblies
1986 thru 1993 Rebuilt upper gearcase
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1978 thru 1986 Tilt motor
1967 thru 1977 Tilt motor
400 800 Stringer seal kits upper gearcase
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400 / 800 Electric Shift Cable
400 / 800 Tru-Course Steering
400 / 800 Stringer Water Pump Components
400 / 800 Lower Gearcase Components
400-800 Lower Gears Clutch Dog
800 Repair cost lower gearcase
1986 thru 1992 Components Lower Gearcase
1986 thru 1992 Gears Upper Gearcase
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1978 to 1981 Hydraulic Assist Gear Ratio Chart
1973 - 1977 Electric Shift Gear Ratio Chart
1982 to 1986 Gear Ratio Chart
1986 thru 1992 Gears Lower Gearcase Chart / Shafts
1986-1992 Transom Components
1985 thru 1995 Propeller Hardware
1986 thru 1992 Bearings Lower Gearcase
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Cobra components Upper Gearcase
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OMC Cobra lower unit gearcase housing assembly replacement years 1986-1993
  • Large housing assembly for years 1986 - 1993 (V6 and V8) and 1990 - 1993 (4 cylinder 3.0L)
  • Small gear housing assembly for years 1987 - 1990 (2.3L 4-cylinder Ford) and 1986 - 1989 (3.0L 4-cylinder Chevy)
  • For rebuilt lower units, see our complete rebuilt lower gear housing page
  • Large housing (#28820) includes the new heavy duty gear sets (#22666) capable of operating with up to 300hp
  • Large prop shaft diameter (1 - 1/4")
  • Reverse thrust washer installed in between the shaft and reverse gear
  • Large gear housing ratio: 12:22 - Small gear housing ratio 13:26
  • Individual gears and clutch dogs also available
  • Complete Cobra complete upper gear housing assembly also available

OMC Cobra complete lower gear housing assembly
cobra lower 28820.jpg
# 28820 Cobra lower unit
Click here for specifications of heavy duty gears
22666 OMC Gear set all V6-V8 with high alloy steel.jpg
# 22666 OMC heavy duty gear set (included in # 28820 assembly)

#28820 - Large Gear Housing

Year
3.0L 4-cylinder Chevy
1990 - 1993
4.3L V6
1986 - 1993
5.0L Chevy/Ford
1986 - 1993
5.7L Chevy
1986 - 1993
5.8L Chevy
1989 - 1993

#28820 Complete lower large gear housing assembly with heavy duty gears $1595.98 *after trade in*

$360 core charge is refunded off purchase price after we receive your core trade in.

#28910 - Small Gear Housing

Year
2.3L 4-cylinder Ford
1987 - 1990
3.0L 4-cylinder Chevy
1986 - 1989

#28910 Complete lower small gear housing assembly $1595.98 *after trade in*

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