When I was floating gears in a semi truck, it became a second nature to just do it by ear and feel. I learned by shifting in the low range of gears in the parking lot of the truck driving school I was in. I would watch the tach and see how much of an rpm difference there was between gears and double clutched it until I learned to float (clutch to release the gear, clutch to enter the gear, but never all the way to the floor cause big trucks have a clutch brake there). You do shave the gears a little when you’re learning, but that’s one reason it’s three thousand dollars for a three week course.
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