The stock location of your TFI allows it to get too hot, which results in failures. Explorers, ect. have the TFI remotely located (away from the hot engine) to deal with this issue. You can remove the TFI from it's current location, mount it into an Aerostar TFI heatsink (an aluminum block with cooling fins) and then mount it remotely from the engine. You will have to splice some extensions onto the harness, and be sure to use the foil wrap (forgot what it's called) RFI shielding. You will also need to "blank" off the hole the TFI left at it's stock position.
There is a writeup somewhere on here about how to do it. It's not difficult. You do need to solder the wiring extensions.
Also, there are at least three different types of screws mounting the TFI in it's current location. You will need to use a mirror to see into the holes to see what you have. There are torx screws, phillips screws, and metric blot type screws, That I have run into. The holes that the screws are inside, are very narrow, and if you have the metric boltheads, you may need to go get a ford "special tool" at autozone, or the like. It IS a metric head, but the mounting hole won't accept many metric sockets, because the walls of the socket are too thick.