Moin, on the subject I have hopefully put together the following right up to now: 1. Front axle gearbox on the front axle, directly connected to the engine and the transmission. • Recommended oil: SAE 75W-90 GL-5 Gear oil oil number ??? Screws (filling + outlet) ??? 2. Rear axle gearbox on the rear axle, transfers the force to the rear wheels. • Recommended oil: SAE 75W-90 GL-5 Gear oil oil number G 055 190 A2 ? Screws (fill + outlet) 2x N 100 371 06 (M22x1.5) ? At the HA there are three Versions with different filling quantities. OAR (0.9 L), 01R (1.5 L) and O8Y (1.1L) 3. Distribution gearbox The distribution gearbox (middle differential) virtually extends the transmission Recommended oil: ATF (Automatic Transmission Fluid) Oil number VW G 052 162 A2 ? or ? VW G 052 145 S2 ? Screws (Infill+Ablass) 2x 018 321 377B with sealing ring ? that would then be the same as driving the axle drives with the gear oil tray DIY – approx. 20°C warm. – First, the filling screw is to be solved, then the draining screw is to be removed. sschraube. – Fill it up until it runs out at the edge of the filling screw. – Fill the wagon horizontally, 5 min, test drive with old screw, final check and new screw(s) pure. And now it is unclear to me: – the ET number of the screws are simply not safe to get out – where are these screws at the VA and in the middle, I can not find them, despite glasses 😉 – which oil comes now exactly into the axle gearbox? To supplement, correct etc. I would be grateful to you. Erwin, Instructions etc. rei only up to the point “Check oil level” Greeting Werner