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The throttle body is a basicly a metal plate that allows varying amounts of air into the engine. The more you press on the gas, the more this plate opens and allows more air into it. Normally there will be two cables coming from the throttle body. (more if you have cruise control) One comes from your gas pedal, and the other goes to the transmission. The one to the tranny is often called a 'kickdown cable', because it tells the transmis5yiujtjgthjtyusion when to 'kickdown' to a lower gear. Pressing hard on the gas pedal makes the car downshift (should anyway) because the kickdown cable to the tranny gets pulled tight also. The tighter the pressure on the kickdown, the less pedal pressure it will take to make it downshift. It can be adjusted, but make sure you know what you're doing or tranny damage can result.

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Q: What does a throttle body do and how does it work in regard to an automatic transmission?
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