yes there is
An automatic transmission is a mechanical transmission which shifts gears automatically in response to speed and/or load rather than requiring someone to do so manually.
If you shift manually, you have a manual transmission. If your car shifts for you, you have an automatic.
An automatic transmission tends to last longer, especially with new drivers. It controls gear changes automatically at the proper RPMs. In a manual, there is a much greater chance of bad shifts, resulting in clutch and gear wear.
If you are asking the function of a modulater valve,it is to smooth out the shifts in an automatic transmission.
An automatic transmission is a type of car transmission that shifts gears on its own. Therefore, cars with automatic transmissions will not have a clutch pedal and will have a selector lever as opposed to a shift knob.
If the pcm controls the transmission the shifts could be inaccurate.
Probably need to rebuild the transmission.
It means that you do not have stick shift in your car, your car shifts gears for you, you don't have to do it, so basically if you don't have a stick shift car you have an automatic transmission car.
A transmission that shifts through gears after moving lever to "d" without driver doing anything no clutch pedal
In a true automatic the gears are applied and released by hydraulic pressure, usually in a special oil. The control system is either an analog hydraulic computer (called a valve body) or on newer cars and trucks an electronic computer that controls the hydraulics.
an automatic transmission shifts through the 4 or 5 gears for you as you accelerate. a manual transmission must be shifted by hand using a shifter and a clutch (located next to the left of the brake pad).
my 98 vw jetta atuo shifts hard in first but fine in 2,3