I asked the same question Kim to another, how shall we say, owner of a shady shop. This clown charged a lady customer around $1300.00 to "rebuild" a TH350. The rebuild consisted of> pulling the transmission from the car, washing it in the parts washer, changing the oil and the filer (using the cheap 2 buck plastic one from CHixx, a new pan gasket, and a paint job. He also rebuilt the converter by polishing the hub and giving it the rattle can rebuild. The main cause of issues was a governor gear. He told me he sleeps quite well on a stack of 100 bills.