I have a 79 v-4 100 horse Evinrude that I think has a bent propshaft. It looks like it wobbles a little when spun by hand. I am not having any vibration or problems with seals. I have owned this boat for a year and have not hit anything, so it has been like this for a while. The last time I change the lu fluid I had metal shavings on both lu plugs. If I need to replace the lu, which year and horsepower lower units will interchange with this motor. Any help would be greatly appreciated.