I just re read the OPs post. Mine actully was horrible if I was super light on the throttle. Then got even worse about normal throttle, But heavy trottle was smooth as butter, could not understand it, but dealer said tranny was slipping from 1-2. So new 4L60E went in and got built to be alot more tough. Wanted a 4L80E but it was to much money and hassle to deal with.