Clearly I'm late to this party but I am in the same boat with my MX-6. Mowing on a flat field and the shaft just sheared in two. My gearbox was made in Spain, at least thats what is on the outside of the box. Don't know where the internal parts came from. My local dealer where it was purchased was nice enough to talk to but would not help out with any of the replacement or fixing. I got the same quote....$1600 for the new gearbox but was told I also needed a new blade mounting adaptor. Total $2000. To fix a "John Deere quality" mower that probably didn't even have 100 hours of use. Very poor customer support, but clearly Deere is big enough to simply not care.