How hard/expensive is it to switch out gearing on an A-body?

69_340_GTS said
But there are millions of cars from all the manufacturers that came with that type of axle bearing. Mopar switched to them in, I think 1970. You very rarely see failures.

oh boy...i have changed 3 on my own newer vehicles.
Go to any dealer and check his scrap bin and you will find many replaced weekly.