Oh I beat the sh*t out of it with the other engine, and too a lesser extent this one. Never anything stupid like neutral drops or anything, but popping it into 1st and scaring the sh*t outta people (under 40mph), and in general hard driving. I mean, it could be either or (trans or TC). It's acting like the TC is shot, this trans is not acting like my other Th350 that was slipping. But, I don't know. I think I'm just gonna be on the safe side and replace the trans AND TC, whether it's a new TC or a good used one. Plus, I think I found the guy I bought my TH350 from. He's got Th350s and converters stacked up like cordwood at reasonable prices, with a guarantee. Plus, I know were he lives.