Looking for a 1976 Merc 850 Lower Unit

Yella dog

Cadet
Joined
Apr 5, 2009
Messages
9
I need a foot/lower unit for a 1976 Mercury 850 85 hp w/ Thunderbolt ignition. Any suggestions on where to find one? I am looking on ebay and I have found some, but, I am not sure which ones are interchangeable. Any advice would be greatly appreciated.
I have been redoing this boat for 2 months and finished it last week. I put it in the water yesterday and when I put it into gear it vibrated the entire boat and made a random roaring sound.
Put it on the trailer and put it into gear and when I spun the prop, it would get to a certain point and make a clicking noise like the dog ears are gone or gears are stripped... I don't know, but, I would like to replace the entire unit. Thanks for your help. JT
 
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