MerCruiser 45-853647 Alpha One Driveshaft Gen II Lower Gearcase 3.0L 4.3L 1998Up Brackets Braces Levers Linkages Flame Arrestor Top Cover 43560A5

Flame Arrestor Top Cover 43560A5 ( Similar to Aluminum ones Stamped 41595 or 91804)

The internals are the same

Used from 1979-1986 on most OMC GM V6 & V8 engines with 2bbl Rochester Carburetor (3" opening) Also used on some (V6 3

There were longer "XD" trim cylinders from 1987-1991 (P/N 14035-1 & 14034-2)  that used a different set of trim hoses

150-235hp (150hp 155hp 185hp 235hp possibly others)

MerCruiser 45-853647 Alpha One Driveshaft Gen II Lower Gearcase 3.0L 4.3L 1998Up Brackets Braces Levers Linkages Flame Arrestor Top Cover 43560A5Item Details MerCruiser Lower Unit Drive Shaft 45 853647 used in all MerCruiser Gen II Sterndrive gearcases 1998 & UP (1. 81: 1 1. 94: 1 2. 00: 1 2. 40: 1) Ratio (which is 3. 0L & 4. 3L) Basically the difference between 45 853648 & 45 853647 is that the 45 853648 was the "heavy duty" version of 45 853648. Dimensionally they were the same otherwise, and the 1998 & up gearcases used a different bearing & retainer on the shaft. This will also replace 45