my Ford F-150 12th Generation (2009-2014) transmission slips when shifting gears

Solution

1. Preparation

• Gather tools and parts, and ensure the vehicle is parked on a level surface.
• Wear safety gloves and goggles.

2. Check and Replace Transmission Fluid

• Sub-steps:
  1. Raise the vehicle securely using jack stands.
  2. Place a drain pan under the transmission pan.
  3. Remove the transmission pan bolts using a socket set.
  4. Lower the pan and drain old fluid into the pan.
  5. Inspect the filter; if it's dirty, replace it.
  6. Clean the pan and magnet; replace the gasket if necessary.
  7. Reinstall the pan with bolts tightened to manufacturer specifications (typically around 8-12 ft-lbs).
  8. Refill the transmission with the correct type of fluid (typically Mercon LV for Ford F-150) through the dipstick tube.

3. Inspect and Replace Transmission Filter

• Sub-steps:
  1. Locate the transmission filter (often accessed by removing the transmission pan).
  2. Remove the old filter from its mounting.
  3. Install the new filter securely.
  4. Reattach the transmission pan if not already done.

4. Adjust Transmission Bands (if applicable)

• Sub-steps:
  1. Consult the service manual for specific band adjustment procedures.
  2. Locate the band adjusters and use a wrench to adjust them as specified (usually involves loosening the lock nut and turning the adjuster screw).

5. Test Drive and Monitor

• Sub-steps:
  1. Start the engine and allow it to warm up.
  2. Shift through all gears and monitor for slipping.
  3. Check for fluid leaks after the test drive.