Hello Tach! The article is not a question – rather an experience report. I sunk my ranger last week into a 70cm deep clay pit. Since I still have no winds I had to drive out. This took an hour thanks to the distance discs only the mirror was scratched by the 45° angle. Distance discs are therefore not only for the optics! The subsequent cleaning took longer however After the mess I had no vibrations, although the carre carried 50 liters of clay and stones (partially fist gross) with it. After three hours of steam jet insert lying on the stream and a very angry washing system owner I drove home first. At speed 85 I got vibrations that could only come from the Kardan. I then only scratched about 10 grams of clay from the cardan shaft and this is the reason on the big disk in front of the rear axle. Immediately the vibrations had disappeared. So if someone has a problem there. A stone of 1cm.