Gear Ratio my boat

Jamz3333

Seaman
Joined
Oct 12, 2010
Messages
72
I have a 1991 16' conquest with a 3.0. It has a Alpha one Gen II outdrive, the lower unit froze and busted and I need to know what the gear ratio is so I can get the same outdrive?
Thanks
 

emilsr

Senior Chief Petty Officer
Joined
Dec 16, 2010
Messages
774
Re: Gear Ratio my boat

It'll be stamped on the starboard side of the upper unit of the drive, just above where the lower bolts on.
 

Jamz3333

Seaman
Joined
Oct 12, 2010
Messages
72
Re: Gear Ratio my boat

could i put a alpha one gen II lower unit on my upper drive thats a different gear ratio? what would it do?
 

proshadetree

Lieutenant Commander
Joined
Jul 19, 2008
Messages
1,887
Re: Gear Ratio my boat

Yes you can change ratios but go to far and you will not be able to prop your boat back to normal rpm. What ratio do you have? Is this the same boat that leaks?
 

Don S

Honorary Moderator Emeritus
Joined
Aug 31, 2004
Messages
62,321
Re: Gear Ratio my boat

EDIT: REMOVED BACKWARDS INFO.

You need an upper with a 1.98 Gear ratio, other ratios are for bigger engines and will not work very well, even if you change props. That is why there are so many different gear ratios.
 
Last edited:

Bondo

Moderator
Staff member
Joined
Apr 17, 2002
Messages
71,097
Re: Gear Ratio my boat

All you need is the lower unit, the gear ratio changes in the lower, not the upper.

Ayuh,... Must be beddy-bye time, eh Don,...
That's exactly Backwards...:D ;)

Gear ratio changes take place in the Upper unit....
The Lower units are all the Same ratio,...
 

Don S

Honorary Moderator Emeritus
Joined
Aug 31, 2004
Messages
62,321
Re: Gear Ratio my boat

:facepalm: Yeah, I kind of blew that didn't I :redface: :redface:

Repeat after me:
DO NOT watch TV and answer questions at the same time.
DO NOT watch TV and answer questions at the same time.
DO NOT watch TV and answer questions at the same time.
DO NOT watch TV and answer questions at the same time.
DO NOT watch TV and answer questions at the same time.
DO NOT watch TV and ................................................
 

proshadetree

Lieutenant Commander
Joined
Jul 19, 2008
Messages
1,887
Re: Gear Ratio my boat

Heck Don I thought he said the whole out drive. I will not do algebra and type on I boats again. Promise
 

Jamz3333

Seaman
Joined
Oct 12, 2010
Messages
72
Re: Gear Ratio my boat

yes this is the same boat that is leaking ( i guess when it rains it poors...lol ) i didnt know if the gear ratio was decided in the upper or lower drive.
ok so any alpha one gen II lower unit will work on my upper drive?
 

oops!

Supreme Mariner
Joined
Oct 18, 2007
Messages
12,932
Re: Gear Ratio my boat

lol....i have been on this forum 3 years.....i have read don;s posts and learned a ton......that is the first time i have seen him get dyslexic......lol....don ...im not gonna let you off the hook for a long time on this one...lol

bill.......thanks for backing us all up here....lol
 

Jamz3333

Seaman
Joined
Oct 12, 2010
Messages
72
Re: Gear Ratio my boat

Ok cool, it gets so confusing when it comes to gear ratio thats I wasn't sure about upper and lower units. Anyways thanks for everyones input!
 
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