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(please inspect yours closely
GM part #14088640 (You may only see the 8640 on this which is normal for some of the later ones)
see pictures (side profiles) to get best idea of condition)
1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 175 190 235 225 245
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MerCruiser Alpha One 1 Lower Unit Gear Set Forward Reverse Bearing Carrier 70-77 Waterski Tow Hooks & Pylons (please inspect yours closelyItem Details MerCruiser Sterndrive Alpha One Lower Unit Complete Gearset That was generally found in 1970 1977 models (Pinion, Forward, Reverse) & Bearing Carrier Used in MerCruiser MC 1, #1, "R Drive" lower units 1970 1977 but also could be used as a complete set in 1978 1982 units if you use all of the gears here. (If your driveshaft HAS A PRELOAD PIN then these are the correct parts, if your's does NOT have a preload pin, then these are NOT the