If you have never put even a stock rear in a jig to see how off they can be than I can understand your ignorance. I never realized it til I bent my first housing, and got another one from a stock Mach 1 and it had to be massaged to even go n the jig. After doing a bunch of them on other cars after that, most are off even without being abused.Not really. Not too many ways and experienced welder can **** that up.