Welcome to Justanswer, My name isXXXXX am here to help.
What they do is have shorter gearing from 1-6 for better performance but the same MPG than the 5 speed
Your looking for the years they made the two engines
Is the top gear in both boxes the same or is one an overdrive?
6 is more an overdrive than top gear
You will be able to get better power from the 6 speed as well
Does that mean the 5 speed has a direct top gear instead of an overdrive ?
Thanks Danny that answers my questions