Ronws - Thanks very much for your comments (my accent is actually English hehe!).
I've had a listen to your version of this song and I must say your vocal sounds far more controlled and refined than mine, I always feel like I'm on the edge of losing control when singing this one as it's such a strain :-( I'd like to somehow harness the control you seem to have.
Jonpall - to answer your questions, I'm not 100% sure how to describe how I get my voice like that. I have a naturally gravelly singing voice anyway (think early Bon Jovi), and I have to really force it to sing cleanly. For the ACDC stuff I kinda reduce the space at the back of my mouth by having my tongue relatively high, and I push the vocal from my throat. It's the sort of thing I could probably demonstrate in person but putting into in words is really difficult!
I'm actually singing that in full voice/full volume. I find it's easier to sing if I reduce the power, but it doesn't sound of feel the same so I go full tilt.