Alpha 1 & Gen. 2 Outdrive Parts *Drawings *Videos

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Alpha 1 outdrive forward gear shims *Lower unit parts

GLM Marine aftermarket shim set for lower unit gearcase forward gear

  • Top cover assembly for Alpha One stern drive years 1984 to 1990
  • Includes top cover bearing #21511 / OEM 31-32575T1 (1-25/32" O.D.)
  • *Make sure to measure your bearing. If you're bearing measures 1-15/16" O.D., contact us by phone or email and we can switch the bearing in the kit to the 1-15/16"
  • GLM Marine aftermarket part # 28400
  • Replaces Mercruiser Alpha One OEM # 94998A4
  • Comes with shim kit # 23261 and 4 bolts

Exploded view Mercruiser drawings
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23220 forward gear shims

23220 forward gear shims

P/N 23220 Shim set $7.29