how to tell what drive ratio my alpha drive is?

lime4x4

Lieutenant Junior Grade
Joined
Apr 25, 2007
Messages
1,040
I have a 1986 mercruiser sterndrive.That is painted so i can't get any numbers off it.Is there a way to determine the drive ratio?
 

WillyBWright

Fleet Admiral
Joined
Dec 29, 2003
Messages
8,200
Re: how to tell what drive ratio my alpha drive is?

By engine displacement for an educated guess.
 

lime4x4

Lieutenant Junior Grade
Joined
Apr 25, 2007
Messages
1,040
Re: how to tell what drive ratio my alpha drive is?

Well i want to verify that the correct sterndrive was installed on this boat.It;s a 5.7 liter chevy small block.According to the paper work with the boat it could be a 1.5 ratio or 1.63 ratio.previous owner said sterndrive was rebuilt last year.But everything is painted.I want to verify i have the correct sterndrive for this boat before i spend more money on props that are for a 1.5 ratio and it turns out i have a 1.63 ratio instead.
 
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