bent rearend housing?

I narrow a lot of rear ends .... used housings are almost always bent to some degree.... especially if the have been down a race track
and when you use a jig for the final welding on ends .... it all works out

I try and trim old housings in a lathe , or get them straightened, but just welding on bracket can bend them a lot
http://www.darkside.ca/rear-housing.asp

I also know of many 9 second cars that at the end of a racing season can barely get the axles out

A quick check is to pull out axle an inch or so and try and put it back in , find the approximate middle of the left, right or up down movement and se if it lines up with the flange