quiethorse

I'm trying to figure out how these cars work. We just got one and it's a 3 speed auto tranny. I know how the newer SUB's work but ours is the kind with the button to activate the 4WD. So I'm wondering if these cars run in rear wheel drive and then engage the front wheels when you push the button or do they run in front wheel drive and the rear wheels engage when you push the button? I'm assuming that power is distrubited 50/50 when the 4WD button is engaged. Also, how slow do you have to be going when you engage the 4WD?