I am changing boat motors from a 20 in. shaft to a 25 in. shaft. What kind of...

kk

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...jack plate do I need?
from an 88 Johnson to a 90 Mercury
 
All depends on the HP if your using 200hp or more>Contact the muafacture as that will be putting a lot of stress on the transom & jack plate adjusted that high up>
 
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