SAME problem going on! Just rebuilt the 69 340 and dynoed it ran strong on there and now that its in the car my brother says it has a bad vibration.. new 2400 stall converter with no weights on it, new dorman flex plate too. 04357 think is the number.. what could be going on?

Last edited by menomoniemopars; 10/20/10 06:48 PM.