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What controls the over drive gear in a Lincoln ls?

The overdrive gear in a Lincoln LS is controlled by the transmission's electronic control unit (ECU). This ECU receives input from various sensors (like throttle position, vehicle speed, and transmission temperature) and uses this information to determine when to engage or disengage overdrive. There's no manual control like a physical button to directly engage or disengage overdrive in the way some older vehicles had. The driver might have an "OD OFF" button, but this button simply tells the ECU to *prevent* overdrive from engaging; it doesn't directly control the gear itself.