I have been fortunate as well. Large impact wrench and high air pressure then put it back on with the impact just not as tight. I offer this idea only if the impact wrench does not work, you might try heating the nut with a heat gun or torch. BE CAREFUL oil is flamable and you CAN do damage with excessive heat. Stay off the yoke and Pinion shaft. Just the nut (I realize it is a tight fit). If you haven't tried the Impact yet then don't try the torch. Good luck.
