NEW OLD STOCK OEM GEAR SET 43-66773A3 / 4366778A3 / 66778A3

Upper Gear Set for Mercruiser Sterndrives 

Alpha One 1983-1990 MC-1, R, MR  (serial # 6225577 and up)

Alpha One 1986-1989 SS (serial # 0A545004 and up) 

Mercruiser 233 1975-1977 (serial # 4200500 and up)

Mercruiser 250 1977 (serial # 4791300-4898729)

The gears are 16-20 Teeth 1.32 Ratio. (66773 = 16T & 6674 = 20T)

This Gear set may also apply to other models - check with your local Merc dealer for more info if needed.

ALL SALES ARE FINAL - NO RETURNS