Is it possible that once the old bearings are out that you can assemble the axle with a new gear in the chassis first and then slide the new bearing over the axle onto the journal and press into the chassis?
Sometimes the bearing compresses as it's being pressed in place and the size of the bore is reduced, causing the axle to bind in the bearing. The bearing then needs to be reamed. Impossible to do with the axle there.
Other times that is the way to go.
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