Thanks for the information guys. I have not really had my new 402 in that long, but the car used to have a 454 (previous owner spun main bearing) so I replaced with this 402 that I couldnt pass the deal up on. Anyhow, I have never had the driveline balanced, so I will start there. I will replace the front/rear u-joints (reminds me of my 4 wheeling days - simply didnt think to go there again), but if this fixes it, it will be a cheap and simple place to get corrected. If that doesnt do it, I will dig into the third member and check out that crush sleeve. Does this sound like a workable plan? I am thinking cost and ease, then going to the more expensive items last. BTW - launched the car hard a couple times last night at it seems tight until you get it upto regular cruise speed (65 or so) then the spinning whine is oh so present. It almost sounds like a bad bearing, but I am just stabbing in the dark. Also when I did a long roasting burnout with the line-lock on, the right tire left a 60 ft strip, while the left side (drivers side) left about a 30 ft strip. Could this be a clutch or something in the 3rd member that is slipping or in need of repair? I have been a chebby guy and new to the whole ford 9" deal. Not sure if this is signs of a limited slip, fault posi, or what?