Sell the tractor? Whole new axle? We aren稚 putting a man on the moon- it痴 a ring and pinion!!! They can be changed- it痴 not the end of an axle, machine or the world.
Yep, happened to me, I shopped and bought a ring and pinion set for my Mitsubishi and DIY rebuilt it.
In my case the 8 bolts that fastened the ring all sheared off probably due to poor torquing or defective locking tabs.
The 8 bolt heads were all sheered off and lay in the case like nice round bolls from being mangled.
When I assembled I used graded bolts with drilled heads and lock wired them as well as used thread 'lock tight'.
To this day I believe that my problem was a 'quality control' issue but being an older used tractor I had no possibility of warranty claim.
That happened at about 700 hours and I have put an additional 800 since my DIY repair so all is fine.
All in all I recall that labor was somewhat in the order of 3-4 hours.
LOL nothing compared to probably 100 or so searching and shopping.
As to shopping I got quotations ranging from $400 to $1200. for the parts.
The higher price quotes all wanted CASH up front coupled with long delivery times while the lowest bid arrived within 4 days at my door and included custom clearance and they took my Visa over the phone.
The worst was down time during my shopping.
Also that crown and pinion incident is what found TBN for me and I have been a faithful follower ever since.