Normally, only the passenger will spend. If I get on mine enough, though, it will eventually have both spinning /forums/images/icons/cool.gif. I'm no rear end expert, but am told that's normal even with an open rear.
If you have an open differential, the right side (passengers)tire will be the one spinning, or smoking depending on your torque output
[color:red]1966</font color=red> [color:blue]V8</font color=blue> [color:red]Coupe</font color=red> http://www.geocities.com/2bav8
5 speed, 4.11s, 10.13 in the quarter mile.
Oh wait, that was a Sammy Haggar song...