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MerCruiser Sterndrive Driveshaft 45-42634 Alpha One Gen 1 MR Lower Unit Gearcase

MerCruiser Sterndrive Driveshaft 45-42634 Alpha One Gen 1 MR Lower Unit Gearcase
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MerCruiser Sterndrive Driveshaft 45-42634 Alpha One Gen 1 MR Lower Unit Gearcase MerCruiser Sterndrive Driveshaft 45-42634 Alpha One Gen 1 MR Lower Unit Gearcase MerCruiser Sterndrive Driveshaft 45-42634 Alpha One Gen 1 MR Lower Unit Gearcase MerCruiser Sterndrive Driveshaft 45-42634 Alpha One Gen 1 MR Lower Unit Gearcase MerCruiser Sterndrive Driveshaft 45-42634 Alpha One Gen 1 MR Lower Unit Gearcase MerCruiser Sterndrive Driveshaft 45-42634 Alpha One Gen 1 MR Lower Unit Gearcase MerCruiser Sterndrive Driveshaft 45-42634 Alpha One Gen 1 MR Lower Unit Gearcase MerCruiser Sterndrive Driveshaft 45-42634 Alpha One Gen 1 MR Lower Unit Gearcase MerCruiser Sterndrive Driveshaft 45-42634 Alpha One Gen 1 MR Lower Unit Gearcase
$ 100.00
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Item Details

  • 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 me and I should be able to help.
  • Very little / Normal wear on the splines.
  • I left the bearing on here, it should be good, but you will want to check it before installation and replace if necessary. This listing is primarily focused toward the drive-shaft itself. For your own piece of mind I would replace the bearing, but this is ultimately up to your discretion. 
  • In a nutshell 
    • Used on all subsequent MR & Alpha One Gen I drives 1983-1990.
    • In short, it replaces all driveshafts that did not have a preload pin.
    • They used the same Alpha One lower gearcase with all of the engines, as the upper gear case was responsible for the gear ratio. 
  • They used the same lower gearcase with all of the engines 1983-1990 so your particular engine is not a factor here so this basically covers most (120hp 140hp 4cyl 165hp 6cyl 170hp 305 350 470 260hp 2.5L 3.0L 4.1L 3.7L 3.8L 4.3L V6 205hp 185hp 5.0L 5.7L V8 etc...
  • Same as Sierra 18-2180
  • Other Parts Included as pictured
    • Retainer 11-42632 / 82519 1 (GLM 23200)
    • Race from bearing 31-36387A1 (Bearing is still on the shaft)
  • Purchase with confidence!

1983 1984 1985 1986 1987 1988 1989 1990


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