5-5121200TP                                
Alpha One Gen II
1.47 ratio 
Standard Rotation (RH)
 
5-5111200TP
Alpha One Gen II
1.47 ration
Counter Rotation (LH)
 
5-5121300TP
Alpha One Gen II
1.62 ratio
Standard Rotation (RH)
 
5-5111300TP
Alpha One Gen II
1.62 ratio
Counter Rotation (LH)
 
5-5121400TP
Alpha One Gen II
1.81 ratio
Standard Rotation (RH)
 
5-5111400TP
Alpha One Gen II
1.81 ratio
Counter Rotation (LH)
 
5-5121600TP
Alpha One Gen II
2.00 ratio
Standard Rotation (RH)
 
5-5111600TP
Alpha One Gen II
2.00:1 ratio
Counter Rotation (LH)
(SN: 0W5355509 and below)
 
5-512700TP
Alpha One Gen II
2.40 ratio
Standard Rotation (RH)
Note: When using the Alpha One Stendrive Assembly as a replacement on earlier (Pre 1983) 4 & 6 cylinder inline models, it will be necessary to replace the standard yoke with a short U-Joint yoke. This yoke is not included and must be removed from the old unit.
-------------------------------------------------------------------------------------
 
For More then 50 Years the word "MerCruiser" has stood for stendrive performance. Choose from more then 20 unique drive systems such as our Alpha one , the most popular stendrive in the world.
 
Alpha Drives:
 
Alpha One- The most popular Sterndrive in the world. Single or Twin application up to 65MPH for gas engine up to 300HP, GEN I and GEN II are available