I have been posting for some time now trying to find out what is going on, my fault, I don't post often and work on car often, on the road a lot.I have a time constraint now. I'm being transfered and am trying to deal with my tranny man before I leave, short time frame.History: I have been having severe vibration when crusing and go into boost about 4psi and stops around 8 or so. With some of you guys help it's been narrowed down to the converter. Changed turbo before but wasn't the problem. Anyway I have learned that while vibrating if you tap the brake it stops or if you are doing a wot blast it won't do it. Youcan hold the brake slightly and it won't do it. My tranny mech. says that he thinks its the ecm because, the converters seldom have problems that he sees and that when he rebuilt the tranny he installed a new converter and the solinoid that works it. Also that the lock up was unhooked when he started to rebuild the tranny, very suspect don,t you think? He said that the converter is not unlocking until around 2.5v tps voltage whitch is to late and the power from the engine is more than the lockup surfaces can take. I have not seen any reference to this type of problem on this or the other board. We tried an additive that is supposed to eliminate shudder but did't work.What do you guys think? It did it with the KB chip and the RA93 I have in it now.