I am not trained as a driver, I am trained as a wrench, however I do not shift on the jake, i progressively shift so in lower gears I don't bring the engine rpm up very high, in second bring it up a little higher. Search YouTube for progressively shifting a truck. This can be difficult pulling from a stop light with ten cars behind you and ther is public pressure not to hold up traffic. A lot of young truck drivers hauling logs and chips here rev the engine up and blat the jake every gear from the main light in town, and I see some old time drivers you could balance a coffee on the hood of the truck when they take off from the same light. I think it is harder on the truck all around to wind it up and jake it every gear. A guy I respect as a driver has a 12 speed Mack he swears by jake shifting. I shut my jake off until I need it then shut it off. Also look on YouTube for videos from smart trucking, he seems to be a professional driver. Remember as a professional driver you are like the captain of a ship and the investment of that truck and its condition is your responsibility to look after. My .02$