Lower Unit Swap

BobFifty

Cadet
Joined
Jan 23, 2005
Messages
12
Hi Folks,<br /><br />I am looking to swap out my lower unit with a used one. I have a 1979 19 foot EBKO Open Bow Runabout with a 228HP (305 Chev) Merc I/O. The Outdrive Serial # is 5324919. I measured the center to center distance from the top 2 mounting bolts and it is 5 1/16 inches. I would like your help with the following,<br />1. Will all pre 1980 drives work and are they all 1.5 ratio.<br />2. Besides salt water use what would you stay away from in a used drive.<br />Thanks for any help you can provide.<br /><br />Bob Fifty
 

Bondo

Moderator
Staff member
Joined
Apr 17, 2002
Messages
71,310
Re: Lower Unit Swap

Bob,<br />Any of the Alpha 1s,+ the MRs will bolt right on..............<br /><br />Alpha 1, GenII, will NOT bolt on......Along with the Oddballs we discussed in your Other thread(4 15/16")......
 

Bt Doctur

Supreme Mariner
Joined
Aug 29, 2004
Messages
19,453
Re: Lower Unit Swap

The gear ratio is determined in the upper unit. any unit with the same ratio as you use will work fine, otherwise you need to change the gearset in the upper unit.
 
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