I know this thread is 7 years old and there are tons of other clock spring threads, but I figured I'd give it a bump instead of making a new one, because surprisingly this is the only one I've found with any sort of instructions on doing this job yourself. If there is in fact another thread with instructions, please post a link, but I haven't been able to find one.
Anyway, a few updates on the instructions in post #4 above, since I tried tackling this today. The torx bit needed is a T-50. Not sure what steering wheel nut Monmix is referring to, but it was just the T-50 bolt holding my steering wheel on. A gear puller tool is required as opposed to a steering wheel puller, and the tool needs two teeth placed 180* from each other, with the hooks pointing to the center. Once again Ford's ingenious engineering department chose to be difficult and not use a steering wheel puller to remove the steering wheel. Go figure.
And on my 2000 V8 Mountaineer with the 2-spoke wheel with radio, cruise, and HVAC controls, I needed to remove the plastic and steel panels below the steering column, as well as the steering column surround plastic pieces. And for this model truck, I believe I have the correct part number which is XL2Z14A664AA.
I say "believe" because I wasn't able to finish the job. This was more involved than anyone else made it seem to be, from what I've read. I see no possible way to replace the clock spring without completely removing the interior pieces I previously mentioned, and I don't see it being possible without pulling apart the ignition either. I ended up accidentally breaking the plastic housing of this wire that goes to the ignition, which I later realized is just for the door ding when the key is in the ignition. Still, the new clock spring includes this wire and connector, but I don't see how to replace it without taking the ignition apart.
There is also this little black circuit board housing with the green connector below the ignition, which needs to be moved to get the clock spring harness out. It takes loosening a screw and prying it down to get the harness out, which is still a little tough to do, and you risk breaking the housing if you don't take apart the ignition.
The space that the harness runs from the steering column down below the dash is pretty tight, so again, taking apart the dash pieces seems pretty much necessary.
If I am missing something and the ignition isn't involved at all, please tell me how to do it, because otherwise I will be taking my truck in to a dealer to do the replacement for me next week. I personally want nothing to do with any ignition wiring, and I have seen no previous mention of the ignition.