Really? Pretty sure the pan is identical, I put a TH350 chrome pan on my TH250C, used all the bolt holes. The only way to tell a TH250 is the stud by the cooler lines, otherwise identical to a 350. The TH250 is weaker than a TH350 but better than a TH200 which has 11 bolts, I believe on the pan. I put a reliable, good shifting, high mileage TH250C behind a 403, first gear lasted a day😳.TH250 looks like the same pan as a TH350, but only uses 11 bolts to fasten.