Last night I finally got around to check the transmission mount bolts for tightness because I've been having some of that klunking sound. I found two bolts only slightly loose, but nothing to be worked up about. While under there though, I grabbed the driveshaft and was able to rotate it by hand about a 1/16th of an inch or so in both directions. Is it normal to have some play in the driveshaft? I'm sure that's what's causeing the clunking sound.