1973 lower unit on a 1989 outboard?

AEROCOOK

Master Chief Petty Officer
Joined
Jul 28, 2004
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872
The lower unit is destroyed on my buddy's 1989 Johnson 40hp model J40TLCEC. We found a lower unit with 15" shaft off of a 1973 Johnson 50hp in the local classified. Can anyone tell me if it will work without any major modifications?
 
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