I'm not sure what you mean by slip but the 10 speed is ECT. It's controlled by the computer. It is designed to skip gears, as needed, up and down. E.g., If you're in sport mode and floor it, depending on a billion conditions, the trans could start in 1 and skip to 3 or 4 as needed. If you come to a sudden stop, it may skip from 9 to 1 or 2 etc. If you drive it super gently, you will likely see every gear hit. And by skip I mean a seamless transition to other gears. It shouldn't be slamming or jerky (though sport mode in any trans with a large number of gears have always seemed jerky to me). Also, the manual states that the trans could be a little harsh in the first 1000 miles and while it's learning. Just FYI... hope this helps.