2007-02-03 18:38:07 · 7 answers · asked by Peter Parker 1 in Cars & Transportation ➔ Maintenance & Repairs
4th or 5th gear depending upon the car.
2007-02-03 18:41:02 · answer #1 · answered by feanor 7 · 1⤊ 1⤋
Normally, high gear is a 1 to 1 ration, that is almost as if the transmission was a straight through link up from the engine to the differential.
An overdrive reduces that ration even more, such as .5 to 1, for example. This lowers the PRM's of the engine, while the car still maintains the same speed. This gives better gas mileage, and less vibration, as the engine is turning slower, and reduces engine wear.
2007-02-03 20:54:21 · answer #2 · answered by strech 7 · 0⤊ 0⤋
With older cars with 4 gears in top gear the output speed of the gearbox is the same as the input engine speed. Overdrive is an extension to the gearbox, 5th gear, which makes the output of the gearbox faster than the input engine speed.
2007-02-03 18:55:47 · answer #3 · answered by David P 4 · 1⤊ 1⤋
It's a device used in automatic transmission to allow the choice of an extra-high overall gear ratio for high speed driving and so it saves more fuel.
2007-02-03 18:44:39 · answer #4 · answered by Desperado 3 · 1⤊ 2⤋
Any gear driven over the ratio of 1:1 is "overdriven". Meaning the engine turns once for the driveshaft to turn once.
2007-02-03 18:53:44 · answer #5 · answered by Anonymous · 1⤊ 1⤋
overdrive on an automatic trans is the lock up torque convertor. when it locks up, that's the 4th or 5th speed.
2007-02-03 19:07:05 · answer #6 · answered by Anonymous · 0⤊ 1⤋
normaly a 5th gear depends on car & modle?
2007-02-03 18:44:58 · answer #7 · answered by witheringtonkeith 5 · 1⤊ 1⤋