NEW OLD STOCK OEM GEAR SET 43-55778A3 / 4355778A3 / 5578A3

Upper Gear Set for Mercruiser Sterndrives 1974-1997. These drives used a 13 spline vertical drive shaft.

MC‑I, R, MR, Alpha One & Gen II (s/n 0K999999 and below) (1974‑1997)

GM 4cyl 120hp, 140hp (s/n 2791957 and up)

The gears are 20-24 Teeth 1.98:1 Ratio. (55778 = 20T & 55766 = 24T)

*The Gear Set will fit Mercruiser sterndrive models with this Gear Ration from 1974 thru 1997*

ALL SALES ARE FINAL - NO RETURNS