Well the problem is it's not the transmission that's slipping it's something electronic it's only if I try to go over 70 I had the same problem with my old trans this new tranny was rebuilt by a very well known company where I live it has a 1 year warranty also but even when I changed all the sensors in the old trans it was very clean and very little debris so there definitely wouldn't be anything stopping the prsssure. when it goes over 70 it's like someone is pressing the brakes and the rpms shoot right up and won't really move on the highway