Transmission "clunk"

[todesengel]

Today I heard the first strange noise out of my car. At idle it will make an occasional "clunk" noise, about every 10 seconds or so. CLutch engages smoothly, holds great, shifts smooth, and doesnt make a peep at anything over 1200 rpm's. Any ideas?

I am going to call my pals at rps and have them start putting together a triple carbon clutch for this thing in anticipation of the clutch shooting craps.