i don't know if there are any u-tube videos, but its not easy to explain with out a diagram or manual(get a factory manual). You can do it without any special shimming tools if all you are going to do is replace the prop shaft. You need to get the rear bearing carrier out before you do anything else(carrier puller, and lots of heat), if you can't get it out, you'll have to go with another plan. Take a good look at the prop shaft carrier bearings while your at it, the roller bearing in the back end usually needs to replaced after a bent prop shaft. Check the price on the prop shaft, carrier bearing, seal kit, and water pump kit, then look at the SEI lower units. You may want to go that route. If you have this on a high speed boat, i would recommend staying with the factory lower unit, but on something like a V20, you'll be fine with aftermarket. Good luck, if you have any more questions, feel free to post them up.
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