Upper Gear Set for Mercruiser Gen II and V6 1.84:1 ratio.
Replaces Mercruiser 43-75325A3.
This gear set is designed for the Mercruiser #1 (1971) through Alpha (through 1996) with "press on" gears.
Gears have 17 teeth on the drive gear and 19 on the driven gear.
If you see a "nut" under your top cap, these will not fit. Your driveshaft should have 13 splines.
Gear Set for Mercruiser upper drive shaft housing Mercruiser #1 1971 Alpha to 1996 (press on gears) If you see a nut under your top cap these will not fit Your drive shaft should have 13 splines not 8 ratio determined by teeth 19/17
It should also fit the V6, the 470/485 (4 cyl) and the Gen II serial numbers K999999 and below.