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Originally Posted by The Newell

More gears normally allows a higher top gear and a lower low, while keeping plenty of mid-range flexibility. A four speed generally has two lower gears, necessary to get it moving from a dead stop or climb steep grades, and then two fairly high ones for city and highway. That tends to leave a fair performance gap between 2nd and 3rd.

Hope this helps,

Joseph

That was a very simple and direct answer....very good, for me anyway.... What about the mode switch. Can you explain that simply.... or does it just hold gears longer?