Mercruiser Upper Gearcase R/MR/Alpha One 1.98 Gearset 43-55778A3 120hp 140hp Exhaust Tubes *This is untested and unsure

*This is untested and unsure condition of seals and impeller

Was used from 1970 1971 1972

Make sure to check and see that the number on your bearing is the same

Very little / Normal wear on the splines

Mercruiser Upper Gearcase R/MR/Alpha One 1.98 Gearset 43-55778A3 120hp 140hp Exhaust Tubes *This is untested and unsureItem Details All 120hp 2. 5L & 140hp 3. 0L 4cyl applications for Pre Alpha R MR ALPHA ONE Gen I, so 1970 1990 as a general rule. The gear set here is 43 55766 & 43 55778A3 (Sierra equivalent 18 2205) (Also Equivalent to 43 55766A2 43 55766A3 as indicated in earlier parts manuals) 20 24 (tooth count) 1. 98 Ratio for 4 cylinder GM Chevy 120hp 2. 5L 151CID 140hp 3. 0L 181CID 4 cyl Sterndrive engines. Upper Driveshaft Assembly 45 55797 Races for