Too much torque demand during deceleration can damage the transmission and clutch. Some overdrives act as an auxiliary transmission unit, and effect the ratio of each gear in the transmission, but the overdrive in your Villager is merely a fourth gear.
To get the overdrive light to turn off, and use your top gear, you should be able to locate a button on the side of your gearshift that will allow you to change the setting. If your overdrive light is flashing or blinking, you are not going to be able to correct the issue by pushing a button.
However, there are situations where you should never use overdrive. One such situation is when you are climbing a hill or going off-road. These applications require high-torque, which is exactly what overdrive restricts. Furthermore, using overdrive is a bad idea if you are looking to overtake a vehicle.
No, it actually burns LESS gas, and that's part of the point. Overdrive means that for every revolution of the engine, the wheels will turn greater than one revolution. This allows for travel at higher speeds while keeping engine RPM down. So, they use less fuel in overdrive than in a lower gear.
The reason for always being on is that it delivers a reasonable speed both during high-speed driving and running on a regular road. At that time, if overdrive was OFF, you would be driving at speed in a low gear. The engine speed would go up, the vehicle would be noisy, and fuel economy would get worse.
The “O/D Off” button prevents the transmission from shifting into overdrive. This can be useful when towing a trailer, climbing a steep hill, or other situations where you don't want it shifting into the highest gear.
Or when accelerating on an uphill slope, the transmission will shift down and up repeatedly, making the ride very uncomfortable. If overdrive is turned off, the transmission can be fixed to a lower gear, the response to the accelerator becomes better, and the engine brake becomes more effective.
You not only can, but you should leave the car in overdrive all the time for normal driving. If you're going down a steep grade, or towing a trailer, turning off overdrive will allow your engine to rev to a higher rpm before shifting, which can help keep your speed down without relying on the brake as much.
Overdrive can help a car to go faster, but it's really focused on allowing the engine to run at a lower RPM while maintaining the vehicle's current cruising speed. Overdrive is an incredibly useful feature, and it's one you should use the vast majority of the time.
The overdrive switch is on by default, until you switch it off. The reason for always being on is that it delivers a reasonable speed both during high-speed driving and running on a regular road. At that time, if overdrive was OFF, you would be driving at speed in a low gear.
When talking of the speed, drive means going in a slow pace where as overdrive means going in high speed. Drive means more power and more gas. On the other hand, overdrive means less power and less gas. When talking of fuel economy, overdrive has an added advantage to that of drive.
Overdrive (O/D) OFF switch.
"OD" is referring to the OverDrive function of your transmission. This is used for highway driving to conserve fuel and achieve better fuel economy. "OD Off" is telling you that the OverDrive has been turned off. This is usually done by a button on the gear shifter or a particular gear shift position marked with "OD".
If you want to know if it is on or off, there is an easy way. While driving on the highway, change the overdrive selector and see what happens. If engine speed (RPM) goes up, then overdrive is now off. If engine speed goes down, then overdrive is now on.
Response time overdrive allows you to push the monitor's response time speed (pixel transition time) in order to decrease trailing/ghosting of fast-moving objects. Depending on the refresh rate, too strong overdrive can cause pixel overshoot or inverse ghosting.
An 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).
