gimmie11s
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Exactly, if you look at the final drives from all 3 company's they are almost the same so its only the in between gears which dont really get used often…. I remember when the NV4500 and NV5600 were always compared by people without brains saying how much better the nv5600 was for fuel milage when the only difference was one gear that split the 3-4 shift from the nv4500 other than that all the other gears were identical ratios… its a marketing game and unless the 3500s start pulling 45-50k lbs then a 6speed is more than enough gears, more gears means more failure points and a larger heavier trans
They have their place in gas engines with a large RPM spread.
Diesels, however, dont have much need/use for 10 speeds due to the short RPM range and flat/mountainous torque curve.