SST-6604 Transmission Fluid Fill Adapter 5R55W Same as OTC 6604 Ford 307-437
11 to 15 bucks on Amazon.
the Valve Body and EPC solenoids need work, there are update kits and repair kits I have found for these.
You can get the fill plug from Amazon for 11 to 15 bucks its made I think by OTC im ordering one myself.
I have found some good resources on this issue and its pretty common for the 5R55S and W. To check the fluid you need an Allen wrench to reach up in the middle of the oil pan to pull a...