Geared oil tray

Hallihallo,
Now again a question to the experts here:
Is it possible to dismantle the oil pan for the purpose of changing the screen(automatic gearbox) without removing this shear? Where are the screws of the tub sitting, how many are they? I got the four of them sitting on the corners of the oil pan, and I still can't get the tub. I think that there's a 5th directly below the right exhaust pipe that you can get without disassembly of the same but not again. Please tell me I'm wrong. By the way, I also opened the line with the T-piece directly in front of the tub (maybe the line to/from the oil cooler) in this way I got a little over 6 liters from the system and not the known 3 liters. I hope it was gear oil? Not that I've done damage again.
Which oil does the Torsendifferential and which one does the Vorderachsdifferential get? Gl 5 or 75W90 Synthetic Oil? Rep. The guidelines provide contradictory information. So that's it for now.Thank you in advance and a nice weekend wishes you, Martin from Berlin