I don't think so... No hard launches, not in the boost all that often or for very long as I don't have a system in place to tune for positive pressure. It's definitely from the transmission out as I still get vibration when off power and rolling. I also find that the vibrations subside a little bit when I get the car warmed up.
I'll be checking the drive shaft today. I know the diff was slightly worn when I installed it... It may infact be time for a rebuild of it. Though I can't say for certain. If I had my bore scope here, I'd drain the fluid and check out the inards for wear. From what I can tell the bearings still seem fairly firm with no play.
Oh yeah. Funny story yesterday. I was doing some trouble shooting yesterday and put her in boost (Vibrations seem to subside to nill if I get weight off the front--yet to check the front bearings as I haven't had time). Heard the blow off valve for the first time and thought it was the greatest sound in the world. So I put her under boost again in hopes of hearing it... all i hear after about 2 seconds in boost is "Pssssssssssssssssssssssssssssshhhhhhhhhhhhhhhhhhh hhhhhhhhhhhhhhhhhhhh." The car then stutters to off. I popped my first coupling! Actually my idle control recirculation line popped off.
