96 Taurus Not Shifting - Can't Move It

Drove the car over 200 miles yesterday. Went to move it within 5 minutes after having parked it at home and car wouldn't shift. Steering wheel mounted shifter is as smooth as butter when going from P to R, N. D and the rest, but doesn't engage any of the gearsr. Had rebuilt transmission put in close to 2 years ago and never had any gear problems since then. Had a brake light switch problem a few months back where shift lever would stay locked in P but no problems with that since it was fixed.

Since I haven't had any trasnmission related issues since I had it replaced, I don't suspect that it could be the trasmission again. Car is solid with 170k miles on it and drives even better than some of the new cars I rent when traveling. Thanks in advance.