Hello Tahoe
Two items could work: They make a bearing remover accessory for pullers. It looks like a cup that is split down the middle. This is bolted on the far side of the arm. It has bolt holes for attaching the puller to it. It allows the usual puller to remove small and oddly shaped items. I bought mine years (and years) ago so I just guessing that it would cost about $40.00 to pick one up today. Second, is a ball joint removal tool, not a pickle fork, but it is used for many of the same jobs. This device has its own bolt that is tightened against the shaft while the fork portion applies the opposite force to the arm. Tighten it up, whack the arm with a lead hammer (and occasionally add heat depending upon how solidly the arm is attached). These little goodies are about $20.00.
While you're at the tool store picking up one or the other of these also pick up a seal remover. It will make the above mentioned removal process easier.
Be aware that the leak is usually (>80% of the time) NOT going to be fixed just by replacing the seal. The bearing also needs to be replaced to eliminate the excessive play that is the usual root cause. Being that you're from Tahoe, roll the dice and take a chance ;>} .... It's only about 4-6 hours work at risk!
To the best of my knowledge, the only way to get to the bearing is to remove the box.
Good luck!