over drive explaination please

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08-30-2006, 12:06 AM

#11

Sean W.

4th Gear Member

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Join Date: Aug 2006

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Posts: 1,116

RE: over drive explaination please

okay... i think i am starting to understand this, still got a still Qs though..

so is, " over drive " like a mod or a replacement for a transsmission. or is overdrive that is inside the transmission, or is over drive just a nother gear? im sorry if im asking so many questions, but i came here to learn..

08-30-2006, 12:10 AM

#12

ShadowDrake

5th Gear Member

Join Date: Aug 2005

Location: Whitehall, Michigan

Posts: 2,638

RE: over drive explaination please

Overdrive is just another gear... for modern transmissions, in manual transmissions, 4th gear is ALMOST always 1:1, and 5th and higher are "overdrive" gears (ratio of .65:1 or so). For the 4-speed autos in stangs, 3rd gear is 1:1, and 4th gear is your overdrive gear.

Quote:

In newer transmissions, the overdrive speed(s) are typically as a result of combinations of planetary/epicyclic gearsets which are integrated in the transmission. In these cases, there is no separately identifiable "overdrive" unit. A number of such transmissions and transaxles are manufactured by Aisin, for use in vehicles produced by many different manufacturers.

You may also want to read here: Wikipedia on "overdrive"

Edit: Also, this may be good... howstuffworks.com on automatic transmissions