When it's appropriate to turn it off and on. Also in the dashboard appears a sign: O/D Off when yo push the button.
2006-12-01 04:28:48 · 12 answers · asked by Anonymous in Cars & Transportation ➔ Car Makes ➔ Toyota
i own a repair shop,and this an extra gear in the transmission that drops the rpm,s of the engine down,and increases speed,and increases fuel economy also,its really good on open road driving and also on long trips,it has increased engine life in all the newer vehicles also,,but its just an additional gear ,and when the light on the dash says its off it not engaged ,,in town use is not recommended for o-d ,because it makes it sift back and forth a lot,,but any other driving you can keep it on,,good luck,i hope this help,s.
2006-12-01 04:56:11 · answer #1 · answered by dodge man 7 · 0⤊ 0⤋
Generally speaking, overdrive (OD) is the highest gear in the transmission. Most automatic transmissions have 3 speeds and overdrive (fourth speed). Overdrive allows the engine to operate at a lower rpm for a given road speed. This allows the vehicle to realize better fuel efficiency, and often quieter operation on the highway. When you switch it on, you allow the transmission to shift into overdrive mode after the certain speed is reached (usually 30 - 40 mph (50 - 65 kph) depending on the load). When it is off, the transmission shifting is limited to the lower gears. For normal driving conditions, operation of the overdrive should be enabled.
It may be necessary to switch it off if the vehicle is being operated in a mountainous area.
The automatic transmission automatically shifts from OD to 3rd gear when more load is present. When less load is present, it shifts back to OD. Under certain conditions, e.g: driving uphill or towing a trailer, the transmission may "hunt" between OD and 3rd gear, shifting back and forth. In this case, switching it off can help the transmission to 'decide'. It may also be advantageous to switch it off if engine braking is desired, for example, driving downhill. For more details, check your owner's manual.
How an overdrive unit works:
The overdrive consists of an electrically or hydraulically operated epicyclic gear train bolted behind the transmission unit. It can either couple the input driveshaft directly to the output shaft (or propeller shaft) (1:1), or increase the output speed so that it turns faster than the input shaft (1:1 + n). Thus the output shaft may be "overdriven" relative to the input shaft. It is actuated by a knob or button, often incorporated into the gearshift knob, and does not require operation of the clutch.
Read more at
http://en.wikipedia.
org/wiki/Overdrive
It won't post link as one so copy and paste it or type it in...
Happy Motoring.....
2006-12-01 04:51:32 · answer #2 · answered by Spinner...428 6 · 0⤊ 0⤋
Think of overdrive as a 5th gear in a 4 speed system. You would take it out of overdrive if you were pulling a heavy trailer, or driving in the mountains. You might take it out of overdrive if you are doing stop and go driving and it keeps shifting up and down a lot.
The majority of the time you would leave overdrive engaged. A bit less power, but a fuel savings and less load on the engine.
2006-12-01 04:35:36 · answer #3 · answered by oklatom 7 · 0⤊ 0⤋
You will see the overdrive button on most trucks and suv's beacuse it is not good for the transmission to run in overdrive while you are towing something so that is why you turn it off so you wont hit overdrive and keep forcing the transmission into overdrive and then back to 3rd. That way you can just stay in one gear while you are towing. In a car its just mainly used for city driving where you dont need overdrive.
2006-12-01 04:33:41 · answer #4 · answered by tony b 2 · 0⤊ 0⤋
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2016-12-29 18:35:39 · answer #5 · answered by Anonymous · 0⤊ 0⤋
When you push the button, it keeps your transmission from going into 4th gear. Some people say you should drive with the OD off. I've never seen how that is practical. It just uses more gas. I just left it alone on my old camry.
2006-12-01 04:32:05 · answer #6 · answered by Anonymous · 0⤊ 0⤋
You can leave it on all the time. It really doesn't do anything until you are over about 35 mph. You can notice it working when you let off of your gas pedal. Try it with and without the O/D on, and you will see the difference.
2006-12-01 04:31:20 · answer #7 · answered by Blunt Honesty 7 · 0⤊ 0⤋
it turns the overdrive on and off.Duh..leave it on except when towing something up a hill...ever think of looking in the manual?
2006-12-01 04:32:43 · answer #8 · answered by Anonymous · 0⤊ 0⤋
It allows the car to click into 5th/high gear, usually used on the highways or anytime you are planning on going fast. I always leave my O/D button on.
2006-12-01 04:32:07 · answer #9 · answered by Paul J 3 · 0⤊ 0⤋
You can leave it on all the time unless you are towing a trailer or camper.
2006-12-01 04:33:02 · answer #10 · answered by Mario Savio 6 · 0⤊ 0⤋