Yes. I think its is backlash in the bevel box I have had 3 bevel boxes in my car and all have the same noise. Usually a loud single clunk when at slow speed over a certain type of bump or pot hole. Once it was very much more pronounced over a corrugated road surface on a trailing throttle, I thought the bevel box was about to self-destruct.
Interesting, now that I think about it, I did hit a small pothole. Could it be something related to the belt geometry as the rear axle swings up? Maybe the belt is loosens up momentarily and the slam is it re-engaging. I should have a look to confirm BB is aligned to swing axle pivot.
