This overview provides a *very* high-level outline. You should consult a detailed repair manual specific to your 2003 Ford Windstar (a Haynes or Chilton manual is a good starting point) for precise instructions, torque specifications, and safety precautions.
General Steps (Highly Simplified & Incomplete):
1. Preparation:
* Safety First: Disconnect the negative battery cable. Use jack stands and safety blocks to securely lift the vehicle. Wear safety glasses and gloves.
* Gather Tools and Supplies: You'll need a comprehensive set of tools including various sockets, wrenches, jack stands, transmission jack, torque wrench, and possibly a transmission hoist. New transmission fluid and filter are also essential. Obtain a new transmission gasket and any other necessary seals.
* Drain Transmission Fluid: Drain the transmission fluid completely before removing the transmission.
2. Removal:
* Disconnect Components: Disconnect the driveshafts, shift linkage, electrical connectors, cooling lines, and any other components connected to the transmission. Carefully label everything for reassembly.
* Support the Transmission: Use a transmission jack to support the transmission's weight as you disconnect the remaining components.
* Remove the Transmission: Carefully lower the transmission using the jack. This often requires maneuvering around the engine and subframe.
3. Installation:
* Install New Transmission: Carefully position the new transmission, using the transmission jack for support.
* Reconnect Components: Reconnect all the components you disconnected in reverse order, ensuring everything is properly aligned and secured.
* Fill Transmission Fluid: Fill the transmission with the correct type and amount of fluid. Consult your vehicle's manual for specific details.
4. Testing:
* Check for Leaks: Check for any leaks around the transmission after refilling with fluid.
* Test Drive: Carefully test drive the vehicle to ensure the transmission is functioning correctly.
Crucial Considerations:
* Torque Specifications: Incorrect torque can damage threads and cause leaks. Use a torque wrench and consult your repair manual for the correct specifications.
* Fluid Type: Use the correct type of transmission fluid specified for your Windstar. Using the wrong fluid can damage the transmission.
* Alignment: Proper alignment of the transmission is critical for proper operation.
* Professional Help: This job is extremely labor-intensive and technically demanding. If you lack experience with auto repair, consider taking it to a qualified mechanic. The cost of professional repair is far less than the potential cost of damaging other components or injuring yourself.
Disclaimer: This is a simplified outline and does not constitute a complete guide. Attempting this repair without proper knowledge and tools is strongly discouraged. Consult a professional mechanic for accurate and safe repair.
