I discovered the same wobbly gear problem when replacing a TA in a SMTA many years ago. I ordered a replacement gear and needle bearing from Steel Wheel Ranch. I might have bought the shaft as well. Sorry, I can't remember if it had a left hand thread.
I just looked at my SMTA parts book. The listing for item #8 (WASHER, Retaining, Power Take-off Driven Gear) shows a 1/2 - 20 NF x 1-1/8" bolt. Don't know the IH engineering abbreviation for reverse threads but, whatever it is, it doesn't appear to be there.
IH does use 'LH' and 'RH' abbreviations in their "List of Abbreviations" at the beginning of the parts book.
I'd zap the bolt with an impact wrench set to reverse.
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Today's Featured Article - The 8N and the Fox - by Zane Sherman. Dec. 13 1998, Renfroe, Alabama. Last niht I dreamed about the day that I plowed the field of about 10 acres over on what Jimmy and Dandy called the Ledbetter field. I was driving the 1948 8N Ford tractor that Jimmy bought in 48 new This was prebably in about 1951 and maybe even befor the house was built. This would have made me to be about16 years old and I drove the tractor for nothing and would have paid to drive it if I had had any money which I didn't, but neit
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