We're lucky when it comes to getting Gleaner parts. We have an Allis (AGCO) dealer about 25 miles away and they stock EVERYTHING for these old contraptions.
I harped at my father to get himself a hydro combine for years and he finally picked one up a couple years ago. Now he tells everyone he wonders how he went so long running a gear drive unit. Being stuck running at a certain speed in the field definitely sucked, especially when weeds were really bad in certain fields that the sprayers had a hard time getting in to. You'd either clog the side elevators or augers up with weed seed, or you were going so slow it took you all damn day to do a tiny little field.
We both wish we would've inspected the newer Gleaner a little better before he bought it. We've had to replace and rebuild a ton of parts on it so far, but we've got it running excellent now.
Here's dad's old F model that I kept patched together for him by some small miracle.. He's glad to be rid of it. It was a high hour machine for sure. I fabbed up and replaced the grain box bottom in it, as well as the sheetmetal bottom of the bean head. Both were worn as thin as tissue paper.
Here's his new pride and joy M2 Corn and Soybean Special before we installed his rice tires. This was minutes before we headed home with it. This is the largest machine he's ever owned and he loves it, except for the cost on some of the parts. We've got to replace the auger's hydraulic/chain driven pivot bearing system pretty soon and it's ungodly expensive. They can't be rebuilt according to a local farmer that used to be a Gleaner mechanic. Only replaced.