Wouldn't shift into reverse
My truck had been sitting for 4 days, and after starting it would not shift into reverse. With the shift lever in reverse the truck would not move. I then shifted into neutral, and back into reverse but it still wouldn't budge. Then I decided to give it some gas and I heard a loud metal clank noise and the truck jerked and finally moved backwards. It's been fine ever since.
Any idea what caused this, and if it's a sign of worse things to come? It's a '03 XLT with the 4.0