A 3/4" drive impact wrench and plenty of air pressure handled the one I reworked some time ago. You can also use a big pipe wrench on the yoke on the shop floor, and a 3 foot cheater bar over a 3/4 drive breaker bar and jump up and down on it.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!