Transmission has been working fine. Drove it yesterday and pull it in low, shift to second, back in low shift to high at 6200 as I always have done for the last 20 years. 312 warmed up a bit with mummert parts. Well today get in the car and second gear has left the building!!?? Fluid is clean and I don't have a clue. I am mechanic by trade but never seen one do this. We are in Texas fighting the storm and I work for the county and will be busy for the next few months. Just looking for some suggestions. I have a lift and can have it out in 15 minutes but before I do i figured I wud ask for help from the best!! Thanks!!