Forum Discussion
kohldad
Sep 04, 2014Explorer III
Huh? Both types have gears which multiply torque.
Torque converters multiply the force by design, most are typically 2x near stall. It does come at a cost of generating heat in the torque converter because of the oil being pressurized. This is why, along with fuel economy, modern auto transmissions lock up the torque converter more often then old style which usually only locked up in the highest gear.
So a manual transmission with a 3.0 first and 4.0 rear end would have a final ration of 12.0. An auto with the same 3.0 first and 4.0 rear end combined with the 2.0 torque multiplier would have a final ration of 24.0. Numbers are theoritcal for easy math but show the advantage.
This torque multiplacation factor is the main reason manual transmissions have a much lower 1st gear than an auto transmission in the same truck.
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