2002 zr2 . Ran good last night. Trans has always worked perfect. Never noticed any slippage of any kind. This morning, pulling out of drive it felt like it was slipping. Got worse as a went. Pulled off road in less than a mile. Checked fluid. Still cold and level was at lower end of safe range while running. Now wont move. When I first start, sometimes it will creep forward just a bit. Increase rpm. And it just sits. It stops moving completely. Any help would be appreciated.