Ditto on the above comments. A big rig clutch is for starting and stopping- - - - -once the vehicle is moving, stay off the clutch and just "float" the power, neither accelerating nor decelerating. The shifter will slip into neutral, and as the RPM drops, it will slip into the next gear without grinding. It will take several missed shifts before you get the hang of it, but once you get the moves dowm pat, shifts are much quicker and less stressful to the engine and trans than shifting by using the clutch.
Jerry
