Don't take this as bashing MM's, because I have been a MM guy for 30+ years. The G1000 would be the last MM tractor that I would want to use for work. Almost every G1000 that I have known of has had rear end(ring and pinion) failures at some point, and the thing is new ring and pinion sets are nearly impossible to come by these days.
Even the MM engineers at the time they were building them knew the design was not ready for production, but the company pushed them out the door anyway. MM did replace the bad ring and pinions early on. Some people I think are under the impression that the ones that were replaced are OK and will last forever, but many of the replacements later fail as well.