not a problem john, I find myself having to bite my tongue a lot when I read some of the posts on the different forums , as you mentioned if you leave out one small detail some 14 year old "expert" drills you over it. yes you are correct on the "borg warner" housing issue , in my last job we did a lot of work for DANA the manufacturer of that diff and I was surprised to find out that the center section of the diff is completely assembled (all gears,bearings , limo hemisphere and back hat) before the housing tubes are pressed in and puddle welded into place. so its not surprising that they aren't straight. and as you mentioned they bend under load anyway .here is a pic of a sheetmetal housing I made for a torana drag car , it had to be straightened after every weld event and then we ended up machining the diff center mount face and re drilling the stud holes to get it right again , no offence taken or intended.

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