Ok, I've been under the car. There seems to be a little (very little) play in the center support bearing- i can barely wiggle the drive shaft in a perpendicular direction to the shaft. I don't feel that this would cause the noise (maybe a vibration upon acceleration). Here's the strange thing, I can rotate the drive shaft almost 1/4 turn- is this normal? The noise that is made when I reach the end of travel sounds very much like the problem 'clunk' . The car is in park and on back wheel ramps. Maybe I'm not doing this right...

here are my new questions:
1. What kind of play am I looking for? if the flex disks are bad
2. What is acceptable rotational travel for driveshaft?
3. Should I be looking for something to tighten the differential?
4. Should I be using jack stands instead of ramps?
5. What is the relationship between magnetism and gravity and inertia?


Paul