So just recently there is a clicking sound coming from the transmission or something down in that area. The clicking sound is a classic "click, click, click, click...." sound and it's intermitten. It won't come and go as you're driving, but you drive to work in the morning and it'll click for the ride there. But then maybe on the way home it won't. It clicks when the car is moving and the clicking gets faster as the car goes faster. The speed of the clicking is related to how fast the car is going, not how fast the engine is spinning. It doesn't seem to be effected by temperature or anything else...I haven't been able to notice any pattern as to times that it chooses to click. And it does this clicking thing about 5%-10% of the time. Anyone have any ideas?
-Josh

Hard to pinpoint- best sorted out on a lift, but my guess is that either a universal joint is on it's way out or the center driveshaft bearing rubber carrier is collapsed or split.
Just replaced one of these on a 367000 mile 245 (really!) and it was no trouble at all. A bit of grease to slide the new rubber support over the bearing and it was on it's way. Make sure to mark driveshaft pieces for proper alignment after- very important.
Ifi t turns out to be a U-joint, I'd say buy a junkyard driveshaft. You'll avoid downtime that way, and can press on a new centerbearing or u-joint for your old one at your convenience, if needed.

Good luck!
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Rob Bareiss, New London CT ::: '87 244DL/M47- 230K, 88 744GLE- 220K, 82 245T-181K Also responsible for the care and feeding of: 88 745GLE, 231K, 87 244DL, 239K, 94 855GLT 189K

And Rob did a great job on Sophie's center driveshaft bearing rubber carrier, too!