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Obviously the big outer gear is damaged. I have two questions-

1. Do you think the crankshaft needs to be replaced too? I can’t tell if that gear is worn/damaged also. Maybe it is hardened and came out okay?

2. What would cause this? Is there something else I need to give attention to so this doesn’t happen to the replacement gear?
 

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Was there any lube in the gearcase? It appears that something got between the ring gear and the small gear. That would cause tooth breakage as there is very little clearance between the teeth of each. It could be that one tooth failed, and that lead to the others being damaged during the time it took to come to a stop. One other cause of breakage is overloading the teeth past their capacity.
If you can find another gear in reasonable shape, I would not have any qualms about replacing just the outer gear after cleaning things thoroughly. I have no clue as to the lubricant required.
tom
 

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Whether one thinks the shaft is damaged or not is a tough call....although tedious, if you are going to fix this, you really have to be sure before investing the time and moolah into the repair....you have come this far...it would be a big setback if you find the part and take the time to do it and re assemble it and then come across further problems...the smaller gear LOOKS unaffected...but I would examine it very closely with a magnifying glass and be extremely critical...feel as much of it as you can with your fingers to see if you determine any unnatural sharp or rough edges...I would be afraid that once the teeth on the larger gear broke off that the debris could have gotten caught between the gears and done some damage to the smaller one...for you to have gotten this far with it....it looks like you know what you are doing...and I have only seen similar problem a few times...please keep us abreast of your progress and more pictures it would be an interesting experience for all of us to learn something
 

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I've never seen one of those 6:1 gearboxes break !..

I'd agree inspecting the small gear very closely is a must..not sure if those are a "matched set" of gears or not--the old crank gear might not mesh well with another used ring gear even if it is undamaged...but it'll probably work for awhile at the least..

I believe the gear boxes used SAE 30 oil just like the engine ..I'd prefer gear oil,but maybe they were concerned that might end up in the crankcase if the seals failed ..
 
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