When you're trying to shift from Park to Reverse/Drive do you have to pull real hard? And it feels like its stuck and it wont move? If so check the shift linkage to make sure it didnt melt. If you have it looped over the transmission, and the transmission isn't grounded correctly your linkage can burn up. It happened to me this summer. I went through 2 linkage cables before i figured out the problem. Try a ground to the frame, and replace the cable. In the meantime use the column shifter. It doesnt have any sh*t lever, but you can still turn it and switch gears.