Mercruiser outdrive parts drawing *Videos *SEI sterndrive

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Mercruiser ball bearing *Lower unit part

Reverse gear bearing *Lower unit sterndrive part

  • GLM 21620 replaces Mercury 30-88957T or Sierra 18-1155
  • Installed into the lower gearcase
  • Compatible with Mercruiser models from 1964 and up (s/n 1684188 and up)
  • Tech support Exploded view sterndrive drawings
  • Not compatible with the 60, 80 and 90 models

21620 Ball Bearing Mercruiser Part 30-88957T

21620 Ball Bearing Mercruiser Part 30-88957T

21620 OEM 30-88957T $44.99

Customers who ordered P/N 21620 also purchased:

11410Prop shaft bearing 30-88957T


Prop shaft bearing 11410
If you are pushing out this part in the carrier in order to remove the seals, you may need to replace this part. Replaces OEM 31-30956T, Sierra 18-1158. $19.99

87510 Seal Kit 26-33144A2

87510 Seal Kit 26-33144A2

Lower unit seal kit 87510

is required when re-assembling the parts in the bottom end. Replaces OEM 26-33144A2, Sierra 18-2652. $44.99

11020 Reverse Gear 43-92320T

11020 Reverse Gear 43-92320T

Reverse gear 11020

Compatible with stern drives up to 1983. Does not work on the MR or Alpha 1 models. Replaces OEM 43-92320T, Sierra 18-2409.