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I just got a lower unit for my boat motor (1989 Evinrude 155hp), but I can't determine if its a 20" or 25". Does anyone know how to measure the lower unit (if I'm saying it right) to determine if it is 20" or 25"..
Measure the length of the driveshaft from the top to the lower unit mating surface (with midsection). If in the range of 27" it is a 25" gearcase. If in the range of 22", then it is a 20" gearcase. Doesn't matter exact numbers....there is a 5" difference, so to determine which one you have, you gotta just know the ballpark.
If you have the wrong one for your motor, it is a real task to swap the driveshafts, by the way.
