I realize this is my first post here... Hope I don't have to do some initiation to fit in here before I start asking complicated questions! 
I have a few John Deere tractors and love all things Deere.
730 Shift Issues
This started a while ago. You could do the trick where you move the shifter from the left and right corners and bang it in each corner and then you could shift through all the gears. Then occasionally you couldn't get it into high gear and occasionally as it would go into the 5/6 slots, it wouldn't engage when you let the clutch out.

I pulled my 3 bottom with it last year in third gear and sounded like it was going to grenade so I stopped.
Now recently I pulled it into the garage and can only shift on the right side so I pulled the cover off.

Some rust but the shifter looks good.

The forks look like they've been brazed before. Not sure about the wire...

Also when I changed the oil a small 3/8" diameter ball bearing fell out. So I'm thinking one of the shaft bearings is bad...
What should I do next?
I have a few John Deere tractors and love all things Deere.
730 Shift Issues
This started a while ago. You could do the trick where you move the shifter from the left and right corners and bang it in each corner and then you could shift through all the gears. Then occasionally you couldn't get it into high gear and occasionally as it would go into the 5/6 slots, it wouldn't engage when you let the clutch out.

I pulled my 3 bottom with it last year in third gear and sounded like it was going to grenade so I stopped.
Now recently I pulled it into the garage and can only shift on the right side so I pulled the cover off.

Some rust but the shifter looks good.

The forks look like they've been brazed before. Not sure about the wire...

Also when I changed the oil a small 3/8" diameter ball bearing fell out. So I'm thinking one of the shaft bearings is bad...
What should I do next?