MerCruiser Sierra 18-2180 45-42634 Driveshaft Alpha One Gen 1 Lower Unit 1983-90 Valve Covers The main difference between all

The main difference between all of these is port configuration

Notable Parts Included: (you will receive items as pictured)

7L / 305 5

Splines: 15

Found on Johnson / Evinrude V6 Outboard applications 1980-1987 (150hp / 175hp / 225hp / 235hp)

MerCruiser Sierra 18-2180 45-42634 Driveshaft Alpha One Gen 1 Lower Unit 1983-90 Valve Covers The main difference between allItem Details Sierra Marine 18 2180 MerCruiser Lower Unit Drive Shaft Equivalent to 45 42634 used in all MerCruiser MR & Alpha One Gen I lower units 1983 1990 <<< Please make sure that the one you are replacing does not have a pre load pin**** If you are looking for one with a preload pin (1970 1982), please contact us and we should be able to help. Very little Normal wear on the splines. We left the bearing on here, it should be good, but you will