Propshaft gearis typically held in place on the prop shaft with a set screw that is often hidden in the shoulder of the water pump eccentric. Clean the grease out and look through the hole where the water pump goes. If not a screw, there might be a pin, but most of the time its a slotted set screw.
Once the fastening thing is out (whatever it turns out to be) the propshaft can be driven out of the gear. Only after the propshaft gear is out of the way can you drop the driveshaft down far enough to knock out the retaining pin and pull the shaft out of the gears.
I’ve never seen a driveshaft and lower crankshaft stub ground down the way these look. There’s supposed to be a keyed sleeve coupler that fits over the crankshaft and driveshaft ends with fixed keys that fit into corresponding slots on both shafts. The pics of your motor show pieces that are ground down to next to nothing. I’m afraind that if you want to fix it correctly that extensive rehab work is going to be necessary on the crankshaft, and the drive shaft should be replaced entirely.
Here’s a look at a Wisconsin I owned a few years back. The lower unit isn’t correct, but the crankshaft and coupler sleeve are.
Best,
PM T2
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He's livin' in his own private Idaho..... I hope to go out quietly in my sleep, like my grand-dad did..... and not screaming, like the passengers in his car...