Inconsistency

[Wilson1]

I had a very similar issue. Sent a good converter back to be freshened, when it returned it would do good for the first pass then the car would do weird things. It was a sprag converter. I had it cut twice, chased my tail looking at everything else on the car, finally at the end of the year, tried a different converter, the car went on kill. Both times I had the converter cut I was told that there was nothing wrong with it. There was something wrong with it but they just couldn't find it. One of the trans guys that cut the converter has it in his shop now and he told me he was going to find out just what was wrong. I have called him twice and he still doesn't have any answers.

If you changed the converter and the car is working, my advice is to not send the converter back that was causing you problems if it has been checked once, but junk it and start over. I would go back to the 8" if you still have it and get it tightened up. Good luck, this can be a very frustrating and time consuming problem.