How to Replace Transmission Lines on Ford Trucks

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Ford trucks equipped with an automatic transmission, utilize an automatic transmission fluid cooler integrated into the radiator, to maintain proper operating temperatures within the transmission. Automatic transmission fluid flows through a steel and rubber line to the cooler in the radiator, where air drawn in from outside the vehicle by the engine fan draws heat off the fluid, which then returns to the transmission through another steel and rubber line. Over time, these lines may begin to leak causing low fluid levels in your transmission. Driving your Ford truck with a low transmission fluid level can cause serious damage to your transmission.

Things You'll Need

  • Automotive jack
  • Jack stands
  • Wrench
  • Waste oil collection pan
  • Socket set
  • Automatic transmission fluid

Removing the Transmission Lines on a Ford Truck

  • Raise the vehicle and support with jack stands underneath the frame or axles.

  • Drain the transmission fluid. Locate the transmission pan drain plug underneath the transmission. Place a waste oil collection pan underneath the plug, and remove it using an appropriate sized wrench. When all the transmission fluid has drained out, replace the drain plug.

  • Using a wrench, remove the transmission line fittings from the side of the transmission.

  • Using a wrench, remove the transmission line fittings from the radiator.

  • Using a socket, remove the brackets that secure the transmission lines to the vehicle's frame.

  • Remove the transmission lines from the vehicle.

Installing New Transmission Lines on a Ford Truck

  • Lift the new transmission lines into position along the vehicle's frame.

  • Reinstall the brackets that secure the transmission lines to the frame.

  • Using a wrench, thread the transmission line fittings into the radiator. Tighten the fittings.

  • Using a wrench, thread the transmission line fittings into the side of the transmission. Tighten the fittings.

  • Fill the transmission with the appropriate amount of fresh automatic transmission fluid. Consult the owners manual for your vehicle to find the appropriate amount.

  • Lower the vehicle.

  • Run the engine and visually inspect the transmission lines for leaks.

Tips & Warnings

  • Most auto parts stores, which accept waste engine oil, will also accept waste automatic transmission fluid. Always follow local regulations when disposing of waste automatic transmission fluid.
  • Always follow the instructions listed in your owners manual when lifting and lowering a vehicle.

References

  • "Chilton Ford: Ranger/Explorer/Mountaineer 1991-99 Repair Manual;" the Nichols/Chilton Editors; 2005
  • "Haynes Ford Ranger Bronco II Automotive Repair Manual 1983-1992;" Chilton; 1999
  • "Haynes Ford Pickup and Bronco 1973-79;" Chilton; 1999
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