I don't own an svt but i've seen this problem twice now...the bracket holding the cv shaft to the block had come loose causing the exact same problem that your having....Is that a carrier bearing of some sort cause the shaft is so long? hard to check i guess unless you can get it in the air

96 zetec gl.dynomax exhaust(self bent) KKM intake..Bridgestone Potenza RE-910's...other mods also
87' Ford Thunderbird..Now my daily driver ( the wife uses the contour mostly) true dual exhaust with the super mystery mod.(hey there not even there!) tinted windows and stereo upgrade. the $200 car is starting to be a great car