A pinion gear remover is the easiest and best way to do it, obviously.
I've done it with a jig that held the back end of the pinion gear and then I tapped out the shaft/motor with a punch.
To put back on the new pinion...I made another jig to support the tail end of the shaft while I tapped on the new pinion gear.
Honestly it was a pain in the ass...I would have bought a proper pinion gear puller/installer if it wasn't 2am in the morning when I did it.
Tys
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