Good morning,
I would verify the fluid level for the transmission to be sure it is correct.
https://www.2carpros.com/articles/automatic-transmission-problems
If that is okay, I would change the fluid as dirty fluid will cause this issue.
https://www.2carpros.com/articles/how-to-service-an-automatic-transmission
Beyond that, you may have an internal failure requiring removal and inspection of the transmission.
Roy
Transmission Fluid Drain and Refill
Removal
1. Raise and support the vehicle.
2. Place a suitable container under the transaxle drain plug.
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3. NOTE: If an integral problem is suspected, drain the fluid through a paper filter. A small amount of metal or friction particles may be found from normal wear. However, if excessive metal and friction particles are present, internal service will be required.
Remove the transaxle drain plug and drain transmission fluid.
Installation
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1. Install the transaxle drain plug.
After the fluid has been drained, clean the drain plug threads and apply a small amount of Pipe Sealant with Teflon 09 D8AZ- 19554-A or XW7Z-19554-AA or equivalent meeting Ford specification WSK-M2G350-A2.
2. Lower the vehicle
3. Add 3.7 liters (3.9 quarts) of MERCON(R) V Automatic Transmission Fluid XT-5-QM or equivalent meeting MERCON(R) V specification.
4. Start the engine and run through all gears for a total of five minutes at idle. Turn off the engine.
5. Repeat the previous steps to help flush fluid from the torque converter.
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Tuesday, September 29th, 2020 AT 1:50 AM