Lower unit compatibility

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Wrboz

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Hello. I have a 1986 Johnson outboard, 20 HP, 20 inch shaft. It needs the lower unit replaced. I think I can use 20/25/30/35 HP lower units, but I’m not sure what years are compatible with my ‘86. Anybody know?
 

RaisedByWolves

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As for exact years I’m not sure as I go by looks, if it looks right it will fit. Water intakes, shift linkage access plate or no plate, etc.

The 35 and possibly the 30 lower unit may have a different gear ratio than the smaller hp motors while still having the same outer appearance.

Sorry I can’t be more specific.
 
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