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This shaft is actually manufactured with a groove or "scoring" at the point where it enters the transmission case, so it is ready-made to fail at that point first. Not very thoughtful of the engineer who designed this part that is linked to a long lever (the shifter).
I may try to drill and tap the end of the shaft, then pin the shaft together with the part that remains attached to the shifter rod. I will either fashion a "keyway" in one side with a "key" to keep the tapped pin from rotating and backing out, or drill another hole in the edge of the shaft and insert a roll pin into the mated ends to accomplish the same thing. Although this sounds a bit involved, I think removing the left rear wheel for access and drilling some holes in what would otherwise be trash is at least worth the try.
The alternative is the 12 hr estimated repair job by the local dealer.
I also mostly use 'B' range, so I am glad it broke while in that selection. The dealer did not feel there was any risk of operating the tractor this way.
Woody

JD 4300 Sheared off shift shaft
John Deere Tractors
Replies 3 Post by Woodenspars

Woodenspars has posted a new photo.

Subject: Bonfire the easy way.

Description: <br>My son wanted to roast some hot dogs. So.....

Bonfire the easy way - New Pix by Woodenspars
Photos
Replies 1 Post by Woodenspars

Woodenspars has posted a new photo.

Subject: Capacity of a 430 loader.

Description: <br>I cut this pine tree on my property in Maine. It started growing in the State of Massachusetts. How do I know this?
It is now the 2nd floor of my house.

Capacity of a 430 loader - New Pix by Woodenspars
Photos
Replies 1 Post by Woodenspars

This thread was very helpful to me about a month ago. I had a similar issue this winter and last. The problem went away last Spring when the weather got warmer.
My problem turned out to be the thermistor, aka "chiclet".
A few days before replacing it, I had success starting the tractor after aiming a blow dryer at the thermistor for about 15 minutes.
Instead of soldering the new one on, I used crimp connectors on the wiring with heat-shrink tubing over the connections. I was able to pull the fuse panel out on the right side enough for easy access to the old thermistor
I haven't had any more start problems. Cost of the thermistor was about $3.50
Thank you to everyone that contributed to the thread.
Woody

John Deere 4300 will not start HELP
John Deere Tractors
Replies 18 Post by Woodenspars