I'm assuming that the rear axle is changed by using a suction gun not removing the cover? (because it looks difficult to remove the cover with the diff in the car) and there's no drain plug?
I do have a suction gun but I prefer to do a full drain if possible.
Also, anyone have the specs on the fill/drain plugs for the trans (5MT, 335i) and rear end? I would like to order some magnetic plugs before changing fluid, esp. if I am not going to be able to do a full drain. thanks!