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1977 Glassmaster Gulfstream 900 ESD

its call a MC-1 lower , what is that number you refer to? If a drive serial number
it is used for the 120-140-165 outdrives .All depends on the engine for what gear ratio needed
 
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sterndrive 4522399 the number was found on my 1977 165 hp 250 inline GM
where is the engine number located in my owners manual it says 4484405
thanks for all your help
 
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