The transmission shifts firm in reg mode. T/H mode is medium to hard shifts which is fine. Downshifts were surpring at first in TH as I did not expect it to run RPM's to 3000 for exhuast brake etc. Once i got used to it, I began to like it. I was never able to slow my toy hauler 5th down on a 6% grade without feathering the brakes on my 05' with a pac brake 6 sp manuel. The truck now slows me down to the point I have to speed up for traffic behind me. Power was good and kept me at the speed limit without effort. Glad i got the 4:10 towhaul. Tows the 5th at 70mph without effort. 62 MPH was max with 05'. 5th weighs 17K loaded.