I just bought a purple 1996 GMC Jimmy from a friend. It snowed 5 inches last night and I never got to test the 4 wheel drive till now. Well it dosen't work............ I have no clue what to do. I have 3 little girls and spending a lot of money this month on them. Don't really have the money to see a mechanic. Can anyone help me????? Give a few ideas? ? ? I have friends that will fix it, if they knew what to do....Please help me