First time poster... with a couple of questions.

[38 coupe]

Regarding the rear axle, which version is in your car? There is an "early" rear axle (actually most of 32 production) with a round flange where the torque tube bolts on, and a much improved "late" rear axle with a scalloped flange where the torque tube bolts on. The early axle shares many internal parts with Model A Fords, while the late axle shares many internal parts with 33-34 Fords.
The accepted fix for the rear axle wheel bearing surfaces is taking the rear axle apart and having the rear wheel bearing surfaces fixed by turning down the outer diameter and sleeving.