![]() Also, the control of these devices is usually accomplished by fluid pressure that is controlled by your vehicle’s computer. These bands and clutches are designed to operate in a wet environment, meaning some lubricant should be present to ensure proper operation. This is usually accomplished through a series of bands, wet clutches and springs. The difficult part is figuring out how to allow any of the gears in the transmission to be coupled either to the input shaft or the output shaft, be held stationary and be able to spin in either direction. Most automatic transmissions have two sets of planetary gears in them to accomplish all of the gear ratios needed to be useful in your car. For a more thorough explanation check out: The gears that aren’t coupled to the input or output shaft may be held still, or allowed to rotate freely. Different gear ratios are obtained by coupling the sun, the planet, or the ring gears either to the input shaft or the output shaft. There is also a third gear around those called the ring gear. The planetary gear set in an automatic transmission is named such because there is one large gear in the middle with smaller gears around it, much like a large sun with planets orbiting it. The theory is similar for an automatic transmission, but the gears are arranged in a much different way. In a manual transmission, when you select a different gear, what you really are doing is coupling a different set of gears to the input and output shafts in the transmission. Similar to a manual transmission, the teeth of the gears in an automatic transmission are always meshing. The backbone of most modern day automatics is still the planetary gear system which was used in the Model T. The automatic transmission in your car surprisingly shares a lot of similarities with the early transmissions in the Ford Model T. Since we all want to be able to operate our vehicles comfortably whether we are going 5 miles per hour in a parking lot, or 70 on the highway, we need a transmission coupled to the engine to turn its relatively low range of operating speeds into the wide range of desired speeds for a car. Also, automobile engines are designed to run efficiently in an even narrower window. If you’ve ever noticed an area where the numbers turn red on your cars tachometer, it’s an indication of the upper limits of your engines ability to safely spin. ![]() Engines that are put in vehicles today are designed to run safely in a very specific range or speeds, or RPMs. Imagine leaving your car in first gear and trying to maintain speed on the highway, or start from a dead stop in fifth gear. All of this makes me think that the alternator is not the problem.The transmission is as necessary in a vehicle as the engine itself. While going home, the light faintly appeared again! The voltmeter is now staying around 12 volts. This time they gave me a brand new alternator. I returned to the auto repair shop again and discovered that they had given me a rebuilt alternator - a bad rebuilt one. Later in the evening, the light came on again but only below 1500 RPM and the meter was ⅓ and around 1 volt. This time the voltmeter was at the proper place, about 2/3rd way up and approximately 13 or 14 bolts. The truck performed well throughout the next day until the battery light came on again. They reported it was a bad alternator and then replaced it. They tested the battery and it was fine until the engine was on and then it was only getting 12 volts, not the 13 or 14 that it should have been getting. After jump-starting the truck, I made it to the mechanic’s shop. I was able to limp for a little while, but it eventually totally quit. First the tach, then the speedometer, and then the accelerator pedal was unresponsive. I was thinking that the problem was probably the alternator and as I was trying to get to my house the instruments began to go out. The meter kept low and then started dropping lower and lower. Two days ago, the battery light appeared again and this time it stayed on. ![]() The voltmeter jumped up and down between high and low. Last week while driving, for about 3 seconds the battery light flickered on and then off.
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