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- Complete brand new lower unit gear housing replaces the Mercruiser MC-1/R/MR/Alpha 1 (One) with 3 year warranty
- For
120/140 4 cylinder serial numbers 2791957 - 6225576, 470/485 model serial numbers 4208730 - 6225575, 165 and all V8 models
1971 - 1990
- Forward bearing size: outer diameter 3.500 inch (#21590)
- Replaces Mercury outdrive OEM # 1623-8951A43
- Replaces GLM aftermarket #18100 with gear ratio 13:21
- Tech support Exploded view drawings
- For upper unit outdrive parts, see our upper gearcase page for all parts with photos
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SEI 106 Aftermarket Mercruiser Alpha 1 upper sterndrive
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P/N SEI-106-1.50 - Mercruiser 1 / R / MR / Alpha One complete upper unit.
- Years 1974 - 1990 models with 205 /230 / 260 horsepower V8 motors
- 1.47 and 1.50 gear
ratio with a 20-22 tooth count
- Compatible with 888, 898, 228,225-S, 233, 250, 260, 5.0 liter 305 and 5.7 liter 350
models serial numbers 2763442 and up.
$1099.89
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SEI 106 Aftermarket Mercruiser Alpha 1 upper sterndrive
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P/N SEI-106-1.98 - Mercruiser R/MR/Alpha One Gen 1 complete upper unit.
- For 1970
- 1990 models, 4 cylinder
- 1.94 / 1.98 gear ratios with
20-24 tooth count - Compatible with 120 to 140 horsepower
models with a 2.5 or 3.0 liter motor
- Years 1971 to 1990, serial numbers 2791957 to 6225576
*Note - before
ordering, please measure your output shaft that goes into the engine. Replacement upper units come with an output shaft that
measures 9-9/16 inch. If your shaft is the 'short style' which measures 8-1/8 inches, please contact us for availability. $1099.89
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SEI 106 Aftermarket Mercruiser Alpha 1 upper sterndrive
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P/N SEI-106-1.81 - Mercruiser R/MR/Alpha One Gen 1 complete upper unit
- Years 1976 -
1982 models with 4 cylinder
- 470 / 485 models and 1986 - 1990
- 4.3 liter V6. 1.81 / 1.84 gear ratio with a 17-19
tooth count
- Compatible with inline 4 cylinder 3.7 liter motors serial numbers 4208730 to 6225576
- and 4.3 liter
185 / 190 horsepower V6 motors serial numbers 6225577 to 0D469858
*Note - before ordering, please measure your
output shaft that goes into the engine. Replacement upper units come with an output shaft that measures 9-9/16 inch. If your
shaft is the 'short style' which measures8-1/8 inches, please contact us for availability.
$1099.89
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SEI 106 Aftermarket Mercruiser Alpha 1 upper sterndrive
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P/N SEI-106-1.65 - Mercruiser R/MR/Alpha One Gen 1 complete upper unit.
- Years 1970
- 1977 models with 165 horsepower inline 6 cylinder
- 1.65 / 1.62 gear ratio with a 24-24 tooth count
- Compatible
with 165 models serial numbers 2763442 and up.
*Note - before ordering, please measure your output shaft that
goes into the engine. Replacement upper units come with an output shaft that measures 9-9/16 inch. If your shaft is the 'short
style' which measures 8-1/8 inches,please contact us for availability.
$1099.89
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SEI aftermarket Mercruiser Alpha One lower unit
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P/N SEI-106 - Mercruiser 1 / R / MR / Alpha One
- Complete lower unit
- Years 1970 - 1990 models
- Serial numbers 2791957-OD469858
- 13 spline vertical
driveshaft
- 120/140 4 cylinder models 470 / 485
- 160/165 6 cylinder
- Up to 300 horsepower
$1199.89
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SEI item number 18100 lower unit OEM number 1623-8951A43
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SEI aftermarket Mercruiser Alpha One Gen 2 outdrive
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SEI 116 Mercruiser Alpha 1 gen 2 upper sterndrive |
P/N SEI-116-1.47 - Mercruiser Alpha One gen 2 complete upper unit
- Years 1991 - up models with 230 / 260 horsepower V8 motors
- 1.47 gear ratio with a 20-22
tooth count
- Compatible with 5.0 liter 305 and 5.7 liter 350 models Mercruiser serial numbers 0D470000 and up
*Note
- does not work with the 305 V8 200 horsepower model
$1199.89 All ratios available,
choose below. For 2.0 and 2.4 ratio, please contact us.
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SEI Mercruiser Alpha One gen 2 sterndrive |
$1307.89
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