Type of transmission fluid

Good evening.

Yes, you are correct. If you use the wrong fluid, it will harm the clutches and seals.

Roy

Type

4x2 Automatic (4R100) Motorcraft MERCON ATF

Ensure the correct automatic transmission fluid is used. MERCON and MERCON V are not interchangeable. DO NOT mix MERCON and MERCON V. Refer to your vehicles maintenance schedule to determine the correct interval.
4x4 Automatic (4R100) Motorcraft MERCON ATF

Ensure the correct automatic transmission fluid is used. MERCON and MERCON V are not interchangeable. DO NOT mix MERCON and MERCON V. Refer to your vehicles maintenance schedule to determine the correct interval.
Automatic 4R70W Motorcraft MERCON V ATF

Ensure the correct automatic transmission fluid is used. MERCON and MERCON V are not interchangeable. DO NOT mix MERCON and MERCON V. Refer to your vehicles maintenance schedule to determine the correct interval.
Capacities


Automatic Transmission Fluid Capacity

4x2 Automatic (4R100) 17.0 qts (16.1 L)
4x4 Automatic (4R100) 17.7 qts (16.7 L)
Automatic 4R70W 13.9 qts (13.2 L)

Okay, my question still remains what transmission fluid do I use in a 2003 Ford F250? It has a 5.4 liter engine it is 4-wheel drive. I want to know how do I know what fluid do I use what transmission uses what fluid and how do I distinguish between transmissions to know what fluid to use? The manual does not tell me anything. It has told me the exact same you just told me.

Since there are three different transmissions, can you post a picture of the transmission pan and upload it here so I can identify it for you?

Roy