Generally speaking, overdrive (O/D) is the highest gear in the transmission. On most cars the automatic transmission has 3 speeds and Overdrive (forth speed). Overdrive allows the engine to have less rpm with higher speed in order to have better fuel efficiency. When you switch it on, you allow the transmission to shift into overdrive mode after the certain speed is reached (usually 30 - 40 mph depending on the load). When it's off, you limit transmission shifting by third speed.
In normal driving condition the overdrive should be always on.
You may need to switch it off when driving in mountainous area or towing a trailer.
[The automatic transmission automatically shifts from OD to the 3-th gear when it feel more load. When it feels less load it shifts back to the O/D, but under certain conditions, e.g: driving uphill or towing a trailer, the transmission can not decide to stay in OD or to shift into 3-th speed and it starts to shift back and forth. That's the time you may switch it off and help the transmission to decide.] .
You also may need to switch it off when you want to slowdown using the engine braking, for example, driving downhill. [For more details, check your owner's manual]
If an automatic car is in off overdrive does it save fuel
4L60E automatic with overdrive.
There is no direct fit.There is no direct fit.
You have to use it when you are driving in mountain areas where to have high speed is not a good idea. The overdrive function does allow the transmission to switch to higher gears.
if it is an automatic leave it in overdrive. the transmission knows when to change into the overdrive gear. if it is a manual listen to the motor. if you have in overdrive and it bogs down while accelerating then down shift to a lower gear.
Its basically just an extra gear. When you use overdrive while cruising at a high speed it lets you stay at the same speed with less RPMs, which saves gas
The four speed automatic transmission is a 3 speed with overdrive for highway use.
Manual control means that it is controlled by humans, and automatic is it will work on its own. An example is a car's transmission. With manual transmission, you have to tell the car what gear to use. With automatic transmission, the car figures out what gear to use on its own by monitering factors such as RPM.
Most cars this is not a problem, the engines are identical.
Every car sold in the US has an option of buying an automatic or a manual transmission.
yes you can all you need to do is switch the automatic flywheel and putt on a standard flywheel and make sure the clutch from the transmission will bolt up to the flywheel.
Hydromatic means nothing car related but, Hydramatic is a GM automatic transmission. The Hydramatic was the first fully automatic mass-produced transmission developed for passenger automobile use.