transmishion issue
 

I have a 2013 ford f150 5.0 super crew. I was going to pass a car on high way yesterday. when I stepped on the gas to pass, I herd a slight whale noise and the trans. seemed to slip. it did not slam in to gear just slid in to the higher gear. this has never happened before an I only have 64k on the truck. whats the issue.

Bruce