By the way, do you know the what the block’s function is? Can it just be removed?

Yes that’s the one.

I looked this up recently as I have the exact rattle in my Discovery 2 at exactly the same rpm. Surprisingly only took a minute to find it’s the block bolted on next to the transmission (hand brake) drum. It has dropped (it moves up and down due being a bit loose) and rests against the main...