^ I use my friends electric Snap On impact when I don't fell like fucking with my air compressor and hoses. They are pretty strong, it took the rusted axle nuts off my S70 with no problem, even after my fat ass jumped up and down on a cheater bar.
Ouch, how loud/hard is the "pop" when you take it out of park. *Cringe
I turn my automatic cars off first; put it in neutral, pull the parking brake up and the put it in park. I would rather have the weight on the brakes than the transmission.