It happened a couple of days ago. Was driving on the freeway for a couple of hours. Stopped at an exit and felt/heard a popping sound. Then it wouldn't shift into any gear except for Reverse. If you turn the car off, it will shift it gear and then I can start it in 1-2-3-4 but then can't shift it out of that gear into another one. There is about 160,000 miles on it. Wondering if it the clutch or the trany. And about how much it would cost to see if it worth getting it fixed. Thanks for the help.