i was driving today and my tranny was shifting weird as hell. it is a th-350. 1st isnt slipping at all, but it wont shift until like 6500-7000 rpms!!!!!!! but when it shifts it is hard, i have a shift kit also. then in 2nd, sometimes when i punch it it just revs then catches at like 6000 rpms, then shifts third. sometimes it will skip out of third into second. what is going on?????? when i just go easy on it, it shifts from 1st to 2nd at like 4500 rpm then goes into second. I don tknoww, would the vacuum line do this, if it is pinched shut??????

 

Sounds like a vacuum or a modulator can problem... Sometimes they get gummed up and stick..