Laurens, do you know if Alain replaced the pinion gear, crush sleeve and shims? If so did he manage to find a supplier for them and some part numbers? There appears to be a new pinion gear in the top photo. If the parts are available it shouldn't be too difficult the set the bevel box up correctly to hopefully run quiet. The bearings, particularly the forward one, don't look brilliant in the photos.
Reading back through the rebuild "Bwitched" did on his BB last year, his problem was caused by a lack of preload of pinion bearings, Alain seems to have had the opposite with them being too tight. Makes you wonder if Quaife are setting the gearboxes at all or just assembling them, the latter is much easier, quicker and cheaper. This would explain why some are quiet and others not.
