BadBlackZ

iTrader: (1)

Just had a Performabuilt Lvl 2 trans and 4000 stall converter installed. I am getting this strange vibration and i cant tell what it is or where its coming from. Almost feels like something is off balance. I really notice it in 4th gear when the converter is locked up and i give it gas, thats when it vibrates so much i can hear it rattle. Almost like the driveshaft is off balance or something.. Also when i put it in gear from like reverse or neutral to drive it is making kind of a metal clank noise. Anyone have any ideas? Maybe something with the driveshaft or the yokes? Thanks in advance guys