I just had my lockup torque convertor rebuilt at Superior Torque Converter in PDX. The say the thrust bearings are a weak spot in them and are replaced as well as the clutch lining during rebuild. Cost was $190 with a 3 hour turnaround time! I haven't been able to put much time in my 91 Monty lately. I was hoping for a Memorial Day assembly, but things keep getting in the way.