727 Rebuild: Some Questions

My apologies...left out the zeros. The shafts look identical except for the odd gold tint. The Charger 727 was supposed used on a race car for a few runs. Perhaps some sort of hardening?

Yes, its a 4 disc drum, so I'll leave it at .045" as you recommend.

...this 727 rebuilding is interesting stuff :read2::read2: