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Upper & Lower 1.47 Ratio

Alpha One Generation 1 - Complete SEI-106 - Upper & Lower 1.47 Ratio

$USD 1,759.00$USD 1,959.00

This is a Replacement for Mercruiser sterndrive alpha one generation I Complete, 1.47 Ratio Standard rotation & Counter rotation
will fit 1973 to 1990


SKU: SEI-147 Category: Tag:

Product Description

Our Upper & Lower 1.47 Ratio Sterndrive alpha one generation 1 Upper & Lower Unit SEI-106 (SEI-147 Outdrive, 1.47 Ratio Mercruiser sterndrives alpha one generation 1) are the highest aftermarket quality products you will find anywhere across America. Note that our products are not rebuilt; they are simply available at the lowest prices you can find.

Therefore, our Sterndrive products are covered by our 3 years warranty, which is why Sterndrive Replacement is your partner this summer.

This unit is a Replacement for (Mercruiser’s R/MR/Alpha One 1/O 1972-1990) Standard Rotation or Counter Rotation 1.47 Ratio

  •  228 HP and up from 1974-1990.
  •  225 HP-S 1974
  •  233 HP1975-1977
  •  250 HP 1977
  •  260 HP 1978-1982
  •  898/228 HP 1977-1982
  •  R/MR/Alpha One 1983-1990
  •  Engines from 1983-1990 include 5.7L, 5.0L (4 barrel carb)
  •  Engines from 1983-1990 include 350, 305 (4 barrel carb)
  •  Engines horsepower 260 HP, 230 HP, 228 HP
  •  Replaces most Mercruiser Sterndrives from 120-260 HP 1967-1990
  1. You must have trim and tilt to be able to use our replacement drive.
  2. You must know  if you have counter rotation unit on your twin engine boat,  look at the propellers to see if they are identical , if they are they are both standard rotation. If the propeller blades are opposite, then the port side should be counter rotation.
  3. If your unit has a short yoke 8 inches and 1/8 on the upper driveshaft, it is a ”Old Style”. Old Style are on all inline 4-cylinders and inline 6-cylinders and up to including 1982.
  4. You must have trim and tilt for replacement to work. If it has tow trim hoses going to each cylinders it has trim and tilt.
  5. Unit has an eyelet on top cover replacement cover utilizes the new style flat top.
  6. How to Identify Sterndrive alpha one generation 1, on trim cylinder uses large rubber bushings and large washers and nut generation II uses small plastic bushing and small e-clips.
  7. How to Identify Sterndrive alpha one generation 1, The top cover square shaped generation II more rectangular.
  8. How to Identify Sterndrive alpha one generation 1, water pump housing is plastic generation II Metal.
  9. To get gear ratio, it is best to remove the top cover and count the teeth on the upper gears.

            Ratio 1.94 / 20-24 teeth
Ratio 1.81 / 17-19 teeth
Ratio 1.62 / 24-24 teeth
Ratio 1.47 / 20-22 teeth

This unit comes with a 9-9/16 new style input yoke.
Install Kit or Anode Kit not include.

Warranty is not covered over 300 HP.

Additional information

Weight 110.0000 lbs

Counter Rotation, Standard Rotation