I ran a British Army GB40 for a couple of years....That also had a wide ratio box that wasn't very pleasant for daily road use...Whether it was the same box as the Aussie B40s I have no idea...I took mine out and replaced it with a 'std' gearbox which was a great improvement...There was and probably still is a strong market for the GB40 gearbox clusters....Much sought after by the trials riders...I nearly bought another GB40 last weekend but was beaten to it by another buyer....Ian
