What is overdrive in a car?

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Overdrive is a final drive ratio that is smaller in # than 1 and it is your last gear...

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usually 4th 5th or 6th depending on the trans.

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but on all of them if your drive shaft turns .75 or 3/4 turn your wheels will turn once...

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hence it slows the engine down for fuel economy but also raises the speed without increasing the engins speed as much (side effect is reduced engine wear due to reduced engine speed too.)

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Note I only used .75 or 3/4 for eas of understanding overdrives... they can be .68, .65 .55 or what ever... but you seldom see them under .60 in number too

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Walt

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1 gear reduction. Which means, when it is o/d off, a 4th gear tranny becomes 3 gear, 5 sp tranny becomes 4 spd. Then the "2" reduce it to 2 gears, L reduce it to 1st gear always.
Purpose? lower gear has more torque, better at hill climbing.

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Overdrive can refer to two different things. An overdrive is a device which was commonly used on rear-wheel drive automobiles to allow the choice of an extra-high overall gear ratio for high speed cruising, thus saving fuel, at the cost of less torque.

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It also refers to a combination of gearing inside a transmission or transaxle which results in the output speed being greater than the input speed. In the latter case, "overdrive" does not refer to a physically separate identifiable part/assembly.

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Final gear ratio is normally 1:1 or one rotation of crank to one turn of output shaft. Overdrive is just that your engine makes one revolution, but the output shaft makes more than one. Actual rotation depend on ratio of overdrive gear.

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huh? ^^ overdrive means the drive shaft turns faster than the engine, thus saving gas, and less power. a tranny without over drive will only turn as fast as the engine. over drive in 4th gear in automatic trannys, or 5th gear in standard trannys.

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OK, Im no car whiz, but my partner is and he put it in simple terms for me so here goes: overdrive is when the wheels of the car are rotating at the same speed as the engine and can either slow the car up when decending or speed the car up when acsending. Sort of like going down to 2nd gear in a manual car. Hoep this explains simply enough. There were more complicated words in my partners explanation, but that is the basic jist of what he said! :)

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As others have kinda stated...it is in referance to the tranmission gearing, final gear be it in either an automatic or a manual is usually considered to be what ever gear is 1:1 anything over that would be considered a overdrive gear. on a standard 5 speed, 4th would be 1:1 and 5th would be something like .85:1 or on a six speed it may have 2 over drive gears...4th 1:1 5th .85:1 6th .80:1
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