One way to check the preloading of the thrust bearing by the converter is to see if there is any play between the converter mounting lugs and the flexplate Mine usually have between .250 and .125 on torqueflytes. When you use a mid plate that removes the clearances nessitating redoing the converter to get some freeplay between the lugs and the flexpalte Take all four bolts loose and see if your converter will slide back and forth on the input shaft If it does and you have over 1/8 inch movement your probally good BTW, I have seen some that you need to put spacers(round washers) between the mounting lugs and the flexplate so you don't bend the fllexplate by tightening the bolts up when the mounting lugs don't mate (touch) evenly with the backside of the flexpaltes, in that case the converter hub was to long to allow the converter lugs to touch the flexplate like they should There is always a reason(and a cure) for component failure, figuring out the cause can be the hard part