So I've tried and failed to replace the transmission in my 240d (due to missing parts).

While doing so, I noticed that the output shaft still spins even in neutral. It's not directly connected, since I can grab it with my hand to stop it even when the engine is running. Afterwards I compared both transmissions on the floor, by hand (turning input shaft and output shaft). The original transmission also does the same, but with less resistance.

So does this mean anything, or is it normal?