Why do trucks have so many transmission gears?
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Short answer: big diesel truck engines only operate from 600-1800 rpm, a 3x range (idle to max operating speed), however a car can range from 600/800 to over 5000 rpm, a 7-9x range, so based on that, if a car transmission has 6 gears, 7 or 9 divided by 3 is 2.33 to 3x,which is how many more gears a truck has, most trucks nowadays have 10-18 gears, most automated truck transmissions have 12.
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