Originally Posted by Green Dragon

They are. In my case, I had to purchase preface 4.4 rear axels. Since my '05 3.0 6M axels didn't mate with the pre face lift 4.4 output flanges and I couldn't just swap em out. The 4.10 manual cars are different from the 4.10 auto differential. The manual diff is bigger and seemed tougher (even more so than the V8 diff).The auto diff however, May be a direct swap and might be better for you. The front diffs interchanged perfectly. Output splines and hubs are the same post-'2000 across the board . Double check my info, as I'm going off the 4.4./3.0.

I have my Manual 4.10 rear and the oem rear axels (which will fit yours as a direct fit as a combo) which are in good shape up for grabs. If interested, pm me.