OMC Parts / OMC Cobra Stern Drive Tech Drawings

OMC Stern Drive 1981-1985 Gear Ratio Chart
T.C.Electronics / Marine Home Page
OMC help me page
Video repair help
Cobra rebuilt upper / lower sterndrives
1978 -1985 800 series lower rebuild kit
1986-1993 Cobra lower unit rebuild kit
800 or Stringer rebuilt upper / lower sterndrives
Electric shift lower unit
Shipping and customs information
International shipping rates by FedEx
Return Policy
Core Return / Deposit
Sending gear case in for repair
Contact us
Aluminum propellers
Aluminum - boat - trailer - mobile welder Toronto area
400 / 800 Steering information
Suggested items for Cobra lower unit repair
1978 thru 1986 Tilt motor
1967 thru 1977 Tilt motor
400 800 Stringer seal kits
400 / 800 Stringer OMC Parts Upper gearcase
400 / 800 Series Replacement Gearcases
400 / 800 Water pump drawing
400 / 800 Tech Support (Gears)
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
1985 thru 1995 Serial / Model Number
1978 to 1981 Hydraulic Assist Gear Ratio Chart
1973 - 1977 Electric Shift Gear Ratio Chart
1981 to 1985 Gear Ratio Chart
1986 thru 1992 Gears Lower Gearcase Chart / Shafts
1986-1992 Transom Components
1985 thru 1995 Propeller Hardware
Ball gears
Boating fishing magazine links
Carburetor Fuel Filters
Carburetor kits
Cbr. upper gearcase repair kit
Cbr. components Upper Gearcase
Comments left on eBay about T.C.Electronics
Distributor Cap
Engine tune up and electrical
Engine thermostat kits
Engine thermostat housing
Electronic conversion kits
Engine Fuel Filter
Engine Water Pump Gaskets
Evinrude Johnson outboard repair manuals
engine coupler
Engine water pumps
Engine gasket rebuild kits Ford - Chevy
Exhaust bellow
Exhaust Gaskets
Gimbal bearing
GM 5.7 litre engine manifold 1990 up
High / Low Profile Stringer gearcase
Ignition Coils
Intermediate housing ball gear components
King (7.5L) gear set chart
King (7.5L) lower unit components
Johnson outboard parts warehouse
Marine Engine Fuel Pumps
Mercury warehouse
Mercruiser parts warehouse
Mercruiser Repair Manual Components
Newsletter 1986 thru 1992 repair techniques upper gear case
Oil seal Stringer upper gearcase
Manifold Chevy and Ford marine engine
OMC Cobra Water Pump
Propeller hardware 800 / 400 series
Repairs or trade-in shipping address
Stern drive troubleshooting starts with carburetor
Stringer Stern Drive Chart 1973 to 1986
Stringer electric shift 1972-77 components
Stringer oil seals application
Starter Solenoids
Sterndrive Repair Manuals
Stringer electric shift switch
transom service kit
Trim sender
Trim Solenoids
Used 1986 - 1993 components
Used 400/800 stringer components
Voltage Regulators
Volvo Penta Warehouse
Yamaha warehouse
GLM Marine product warranty
Oil pump
Boat trailer accessories
800 series upper gearcase repair cost
Drive shafts 400 800 and stringer
ujoint & water pump shaft
U-joints
302-351 V8 Ford engine manifold
Chrysler / Force warehouse
Boat accessories
Bearing component locations
1986-1992 layout lower gearcase
1986 thru 1993 Rebuilt upper gearcase
Rebuild kits
400/800 series OMC stern drive 1981 thru 1985 upper/lower gear ratio, application gearcase chart
LM OMC 1982 thru 1986 upper lower gear ratio.jpg
1981 thru 1985 mechanical shift OMC stern drive upper gear set

OMC 400/800 series gearcase year, litres and horsepower

1981 - 1985

Upper gear case drive gear / driven gear ratio

Lower gear case drive shaft gears / driven gears ratio
2.5 litre 120 hp.
3.0 litre 140 hp.
21 / 18 Upper
13 / 26 Lower
3.8 litre 170 hp.
21 / 20 Upper
14 / 26 Lower
5 litre
21 / 17 Upper
14 / 26 Lower
5.7 Litre
21 / 16 Upper
14 / 26 Lower

Money orders, credit cards, PayPal and US bank transfers
Submit URL free to our web site directory