MOPAR A BODY 8 3/4 REAR AXLE HOUSING 489 DRUM TO DRUM 5 on 4 ½

Just curious but why would it matter ? assuming the job was done correctly it should be straighter than a factory 50 year old housing.
I have one now that I assumed was done correctly and something tells me there is a problem . Just a feeling but I don't like sitting on the side of the road waiting for a hook .