I have no idea how the Titan is set up, but for some early 2000's Fords, like my former 2004 Explorer and some 7.3 Powerstrokes (there are probably others but these I know of), Ford bypassed the in radiator loop for transmission cooling and relied only on the stacked plate cooler sandwitched between the radiator and AC condensor. When doing manuvers that result in little airflow, like backing, there was no other way for the fluid to cool, resulting in high / overheated fluid. In Fords, this overheated fluid would cause the input shaft seal to expand enough to leak. After cooling down it would stop. This was a VERY common problem for those of us who towed with vehicles lacking the radiator loop.