I have a TCI 727 on the shelf now. It didnt make it 2 summers ina mild 340 A body. Basically, they take a stock unit, rebuild it, and install a shift kit. And not a real good shift kit. In some cars, that may be enough, In others, misadjusting, overheating, or whatever means they may not last. They certainly arent anything special. I know more with issues than I do that were perfect. I'm sure there's more to failures than the sticker on the side.