I've been told it's possible to undo the bull gear fasteners through the PTO drive opening. I had an occassion last year at about this time to investigate that, but I felt it was near impossible due to my ham-fistedness and no skills being a gynecologist :)
At any rate, you may have a failed pinion shaft bearing. Don't overlook that. I had one fail utterly and never have I seen a bearing so destroyed. There was probably an inch of free orbit the shaft was revolving around in which nearly locked-up the bull gear action.
The pinion bearing casting is accessible from the outside obviously after the brake drum cover and brake drum are removed. Do NOT make the mistake I did and what I've discovered others have done. It looks for all the world like the pinion bearing casting will pull out of the transmission casting using the three provided tapped jack screw holes. Nope. The back (the portion most internal) of the pinion casting "swallows" some of the arc of the bull gear. The rear end must be split from the transmission and wheeled backward. I broke my pinion casting because of my block-headedness.
Two months prior to the W-9 split I split our 460. The W-9 split much easier in my opinion. What impressed me was how many bolts there are and the robust size they had. Obviously IH didn't want these big hosses coming apart by accident in the field.
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