When I worked at Dana during my college years, each and every rear on the assembly line was individually measured at assembly. Of course, they've got their own quick assembly tools to do so, but they were measured. The same was true of backlash, runout, and a final quick check of the pattern. We assembled alot of Ford rears at Dana, although none were the 8.8"; mostly truck rears for the Rangers and things like the Dana 44, 60, 70 and 70HD.
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Jeff Chambers
T/S #3
11.611 Seconds/116.7 MPH
Chambers Racing Team