This is a ‘54 M38A1 that I am trying to change inner seals and bearings on the rear axle. I’ve watched videos but don’t know which apply to me. Is this axle shaft press fit and I use a puller or is there a pin holding shafts in the differential? I see a pin but can’t remove it cause the gear is blocking it. Forgive me I am new at this and don’t know much if it is a simple and obvious solution.