Well its a sort of a heavy sounding clunk, as i let the clutch out and give the bug power, i am getting a solid sounding clunk, just the one and then its fine again, until the next gear change. I`ve had a quick look underneath, but cant see any damage to the gearbox nose cone, or the gearbox mounts, same at the bell housing end, cant really see anything out of the ordinary. The clutch is a kennedy with a daiken super disc on it, they are both fairly new, with just over 1000 miles on them. The box is a stock AB box which we put on a couple of months back, after trashing a few synchros on my rancho. I cant tell if the clunk is from box, engine or axles. I havent jacked it up, basically cos its persisting it down here right now, just wondered if anyone has any thoughts or ideas on what it might be.