Valdemar.. have you tried doing an oil change on the reduction gear? I am going to change my gear oil this weekend, with red line d6. I will tell you if I hear any difference.
My noise is like you described. It is a very faint clicking noise that you can hear best around 5 mph or less. I hear it when I come to a stop, even going straight. I have switched both front wheel bearings, struts, lower control arms, brakes, rotors, tie rods, and greased the **** out of the splines. The only thing I haven't switched out in that area are the CV joints. They are not torn. It doesn't seem to be getting any worse but it's a really sutle continuous clicking all low speeds. It stops just before I come to a complete stop, almost like it's a servo that pulls out
I'm going to change the gear oil in the reduction gear, and then change both ABS sensors. They are cheap parts. If this doesn't work I'm going to bring it into Nissan and see what they say.