Car transmission gear ratio11/14/2023 ![]() ![]() The valve body of the transmission contains several shift valves. Shift valves supply hydraulic pressure to the clutches and bands to engage each gear. For instance, if the shift lever is in third gear, it feeds a circuit that prevents overdrive from engaging. Depending on which gear is selected, the manual valve feeds hydraulic circuits that inhibit certain gears. The manual valve is what the shift lever hooks up to. The modulator senses the manifold pressure, which increases when the engine is under a greater load. Other cars use a vacuum modulator to apply pressure to the throttle valve. The further the gas pedal is pressed, the more pressure is put on the throttle valve. Some cars have a simple cable linkage connected to a throttle valve in the transmission. There are two different ways that this is done. To shift properly, the automatic transmission has to know how hard the engine is working. First, we'll discuss the key components of the hydraulic system then we'll see how they work together. Passageways molded into the metal are an efficient way to route fluid without them, many hoses would be needed to connect the various parts of the transmission. The passageways you can see route fluid to all the different components in the transmission. It is really the brain of the automatic transmission, managing all of these functions and more. You've probably seen something that looks like this before. ![]()
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