Hi All, I am a new member here and have joined purely because you have managed to solve an issue that has been bugging me for a few hours now. I know this is an old thread but it has helped me immensely. I have just started building the Bugatti Chiron and had got as far as the rear section and gearbox when I decided to connect a motor up to the drive train and test the gearbox. I had real problems with gears grinding in particular selections. I traced it quite easily to the 20 tooth tan gears and the 16 tooth black gears and swapped them around for others out of the same set. I rebuilt the gearbox and tried again with similar results. So i did a bit of googleing and came across this thread. It seemed to be a known problem and so I did as suggested and swapped the tan gears out from an older set. What a fantastic difference it made. I feel happy to move on with the Bugatti build now.
Again I would like to thank all involved in this solution and I will hope to make some sort of valid contribution in the future in way of repayment.
