I also saw Vic's thread, and posted this in reply to your comment in his thread:
I bet you still need to adjust your rear end angle. I've always heard, and read, you don't want more than a 1 degree difference between the two angles. So if your rear end is at 3 to 5 degrees you should be set. 4 degrees would be best as it would match and be parallel to the transmission angle you already have.
Mike might be on to something with the diameter too. I haven't heard that before, but it does make a bit of sense. I have a 3.5" aluminum driveshaft in mine, but it was more for future planning to be able to handle more power, when I was dreaming of adding a supercharger. That's not likely going to happen, but I have the driveshaft for it now.
