Re: Broken Rear Diff / Build Date Please
folks tried to narrow down a build date for the bad ones but I haven't seen an answer to it (from past threads: some folks with failed diffs were marked with what looked like later dates than some others with fine diffs, and also some of the service replacement part's label's dates/numbers were also confusing)
the vendor was not changed, the heat treating process had a flaw and was corrected
The consensus, though, was that the issue was with '06 and some early '07 diffs. By mid/late '07 it was corrected, so your '08 should be fine.
There was one other diff change: the size change made from '10~, from 8.0 to 8.2" ring gear (and, no, they are not interchangeable, because everything was ever so slightly scaled up, including the bolt pattern to the rear axle housing, so the whole rear axle would have to be swapped to adopt it). The consensus is that the 8.0 does fine for most users / most uses, as long as it was not from that early, bad batch.