I think you guys are not getting the point with the 8.8 compared to the 7.5. The axles are the same it is the weak casting thickness of the 7.5 gears and carrier bearing caps. You can put a support to control the cap walking but you will still have the problem of the carrier cracking unless a expensive upgrade which if you spending that kind of money you can get a 8.8 assy used with a good choice of gears for $400 and spend a couple of hours installing it. You will have more money in the gear install then getting the complete stronger rearend.
Twin Turbo Intercooled(TTi)