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I don't know the best place, but you should be looking for a 5R110W. That's the name of the transmission.
If you want to replace it with a different type of transmission, that will take a lot of fabrication work, custom wiring, and a custom computer. Expect to pay many, many times what a 5R110W would cost.
I hope I am in the right forum. I am not much of a mechanic, grew up with wrench throwers if things did not go right, so lost any desire to be a mechanic.
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.