That 1.47:1 is a V-8 drive ratio. You will lug your 3.0 without a
ridiculously low pitched prop, which if you used it, would not be as
economical or effective at the hull speeds you want to operate your boat at.
Get the right ratio. Check with Doug Russel's www.dougrussell.com for
competitive pricing. Also check with your local ships store to look at the
Sierra replacement drives.

Rob
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wrote in message
t...
I have a 1991 Mecury Alpha one Gen I sterndrive with a 1.98-1 gear ratio.
It
is mounted to a 3L 4 cyc engine but the sterndrive ceased this summer and
I
have found another one but it has a 1.47 ratio. Can this sterndrive be
mounted onto the same engine. What about a later year model like a 1995
alpha one gen one would that fit? Lastly what does the upper unit gear
ratio
relate to? Torque...engine speed?

Lots of questions