I thought I would share this find that I discovered. A solid pinion collar made for a Toyota 8 inch axle will fit the 10 bolt on a 95 Trooper. It's slightly longer than the Isuzu needs, so I have the machine shop cut it to the length of the stock one and then shave it half a thou at a time while I'm there test fitting it to get around 3-5in/lbs of preload per FSM. Now it is less likely for the pinion to wander under high stress and the pinion seal can be changed on the vehicle without crushing a new collar.
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