That coupling is screwed onto the front of the countershaft with standard, right hand threads.
Removal is straight forward: Lock the countershaft from turning by engaging the PTO then holding the PTO shaft with a large pipe wrench. Or remove the shift lever and use a large screwdriver to engage 2 gears at once (reverse and 2nd are my favorites!)
Now grab the coupling nut with another large pipe wrench and tug HARD. Or put a piece of keystock into the slot to act as a lever and give it a good lick with a hammer. Once started the nut will spin off the rest of the way easily by hand.
Suggestion: While you're in there, replace the upper (input shaft) seal too. Good chance it also is worn out.
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