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Where is the turbine input shaft speed sensor on a 2004 Ford Freestar?

The 2004 Ford Freestar's turbine input shaft speed sensor (also known as the Turbine Speed Sensor or TSS) is located within the transmission bellhousing. It's not easily accessible without removing the transmission. You'll likely need to consult a repair manual with diagrams specific to your vehicle's transmission type (e.g., 4R70W, 4R75W) to locate its precise position within the bellhousing.