John Deere 4300 diff and lock

This is a hands-on look inside a torn-down John Deere 4300 differential, not a walkaround or buying guide. The creator shows the pulled diff and manual diff lock on a unit with 4,000 hours, explains how the final drive gear reverses axle rotation, and recounts a real repair story involving a cracked diff housing that took two months to source and cost about $4,000. Useful for owners troubleshooting diff issues or curious how this assembly works internally.

Appears to be an individual sharing personal hands-on repair experience rather than a dealership or manufacturer channel.