OMC 400 / 800 series gears and ratio

OMC 1982 thru 1986 upper and lower gearcase gear ratio

OMC 400/800 series gearcase year, litres and horsepower	Upper gear case drive gear / driven gear ratio	Lower gear case drive shaft gears / driven gears gearcase ratio
1982, 1983, 1984, 1985 and 1986 years   2.5 litre 120 hp. 3.0 litre 140 hp.	21 / 18 Upper	13 / 26 Lower
1982, 1983, 1984, 1985 and 1986 years    3.8 litre 170 hp.	21 / 20 Upper	14 / 26 Lower
1982, 1983, 1984, 1985 and 1986 years   5 litre	21 / 17 Upper	14 / 26 Lower
1982, 1983, 1984, 1985 and 1986 years   5.7 Litre	21 / 16 Upper	14 / 26 Lower

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