Mercruiser Upper Gearcase Pre/R/MR/Alpha One 1.98 Gearset 43-55778A3 120hp 140hp Heads I took quite a few

I took quite a few pictures

1987 1988 1989 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001

May also work With Omc Cobra PleasureCraft Indmar MerCruiser Crusader applications as well

120hp / 140hp / 165hp

possibility it might have been used on other models 1971-1975

Mercruiser Upper Gearcase Pre/R/MR/Alpha One 1.98 Gearset 43-55778A3 120hp 140hp Heads I took quite a fewItem Details All 120hp 2. 5L & 140hp 3. 0L 4cyl applications for Pre Alpha R MR ALPHA ONE Gen 1, so 1970 1990 as a general rule. (Actually these were also used on Gen II drives 1991 1997) The gear set here is 43 55766 43 55778 > 43 55778A3 (Sierra equivalent 18 2205) (Also Equivalent to 43 55766A2 43 55766A3) 20 24 (tooth count) 1. 98 Ratio for 4 cylinder GM Chevy 120hp 2. 5L 153CID 140hp 3. 0L 4cyl 181CID sterndrive engines. If you have any questions