Sagot :
A 4-speed automatic with overdrive in the true sense has 5 forward gears, 3 being a lower output speed than the engine RPMs putting out higher torque, 1 being a 1:1 ratio where the wheels are spinning as fast as the engine, and 1 that has a high ratio, spinning the wheels faster than the engine putting out low torque for a higher speed.
A 5-speed automatic with overdrive is the same thing, but with 4 gears being dedicated towards the lower end where higher torque is produced. This puts the engine in its optimum torque band more often when accelerating which will help improve the efficiency and low speed acceleration across the gears.
Now if you’re comparing a 4-speed automatic transmission with overdrive (again, just one) to a 5-speed manual transmission for the same vehicle, then there is very little difference between the