I was answering his quote of my post. That is my point. Tapered are far better then ball bearing for longevity.
Having a shop we are always removing green bearings then pressing and replacing them with the factory style tapered with adjusters back on the axles for customers that had bearing failure . Then they look for a carrier that wasn't modified for their green bearing install so their tapered axles can be adjusted.
Not seeing the OP's car there could be many issues. Maybe his dad had the rear racked over because the wheel house is closer due to axle installation when they were installed. Or didn't the OP have the rear hanging center on the leafs when it was tightened.
My thoughts were the axles. The subject came up and I mentioned what I have seen when owners of cars that decide to install green bearings with no knowledge of the procedure to install them. Its not just tighten them up and your good to go .
You must remove the Preload/equalizer block in the carrier. I have seen several with the retaining plates pulled in at the nuts like a wafer.