The main problem is the nut holding the prop shaft bearing carrier in place.....the bearing carrier is what you see (besides the prop shaft) when you look directly into the rear of the Lower Unit gear housing. The nut holding it in place requires a "spanner" wrench of approximately 4" - the thickness of the housing x 2, in diameter.
Just like your prop, your locking nut is probably frozen and will have to be destroyed to get it off. I used hammer and chisels to get mine off. A grinder disc on a Dremel tool can cut through the nut down to the threads. It will take several places to get it all off, making cuts like every 2" or less around the circumference of the inside of the gear housing......don't cut down into the thread area if you can help it. By then the material area is thin enough that a small chisel can be driven into the gaps you made to drive out the sections you cut.
Lots of PB blaster and since you are going to redo the gearbox anyway, including new seals (like the prop shaft seal(s), some heat will help to get the corrosion to release the SS nut segments.
Then you are ready with more PB blaster and heat to "slide hammer" the prop shaft out which will bring out the bearing carrier along with R gear, the shifting clutch dog assembly, compression spring, 3 balls, and the shift position cam follower. The he drive shaft pinion (located on the bottom of the (vertical) drive shaft, F gear and it's bearing and any shims, and your shift cam remain in the housing. If you have any shims keep track of them and where they were positioned. Depending on what you change you may need to realign the gear mesh using the shims and that takes a special tool unless the old salts on here know of a cheap......or you get lucky and all your replacement parts are the same length and fit back like the original whereby no special tool would be necessary.
I think I got all that correct....if not the hammers will come out and get you the right answer......but that's the way it should be. I answered a 0 reply question. Surely you will get more hits. Good luck.
