I have talked to a few different people about the issues I am having with the th350 in my cutlass. It sounds like a sprag in the converter may have gone out. I just talked with with TSI about installing a built TH400 in place of the TH350. Anyone gone through them before for a built trans? He seemed very knowledgable and the price is very reasonable for all the work that will need to be done to make the swap happen.