Overdrive, what is it?

365

Asked by Jul 16, 2008 at 03:19 PM

Question type: General

Whats the difference between a car with a 4speed+overdrive, and a car with a 5speed auto?

2 Answers

4,435

As simple as I can describe it, 5 speed auto has one more available gear ratio than a 4 speed. A 5 speed auto can also have an overdrive. Numerically a gear ratio below 1:1, for instance .50:1 is an overdrive ratio. So for a .50:1 ratio, that means that for every one engine rotation, the transmission has gone through two full rotation. This advantage allows better fuel economy if matched at the correct vehicle speed range.

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One is a slushbox, the other is a slushbox with a button

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