Getting parts should be easy. Least expensive route will be a used set of gears from a tractor salvage yard. There are plenty of 656s that have gone on to that big barn in the sky, if you know what I mean, so there should be plenty of parts available just about everywhere.
Notice I said gearS. You will want to replace both the drive, and driven, gear in a matched set.
I think these are the two parts you need to replace if indeed the problem is with a chipped/broken gear. These are from the online parts catalog at CaseIH.com by the way:
388167R1 - GEAR, fourth and fifth speed sliding, 37 teeth
388151R1 - GEAR, fourth speed driving, 44 teeth
According to the catalog, they're still available new. I'd still hit the salvage yards to see if any used ones are around. Even shipped across country from one of the bigger places like Steel Wheel Ranch, it'll be lots cheaper than new from CaseIH.
You might be able to find a semi-retired tractor mechanic in your area with his own shop that'll put them in for you at a reasonable price, too.
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