Don't have much for options here. The way my rear end is with the 8.8 it has a round 3.5" flange.
If i want to upgrade anything i have to pull the rear end apart and i don't feel like it.
So it's just your basic steel driveshaft, fully balanced with 1330 u joints.
In order to step up to a chromoly shaft i have to pull the flange off the rear and go to the 4.5" flange (like on the 03/04 cobra) at that point i could go to 1350 u joints, but if I'm going that far i might as well put a slip yoke in there and disassemble the rear to do so.
Get it right, or get it running... I'm going with getting it running. The 1330's will hold up just fine with my expected power levels in the near future