So im wodnering if using maunal would make my acceleration faster, I have scania with 650hp engine, 12+2 retarder transmission, and 6x4 chassis, and i feel like im falling behind when it comes from a complete stop. if i should do manual, how should i shift gears so that its most optimal for acceleration, or should i change my truck build? i usually haul something around 20 tons. thanks