I have a 2001 s-type 4.0.. this morning car will shift into gear but will barely move. had to rev motor. when in gear (Drive or R) under load can hear a whining noise. when in nuetral load off noise goes away. Any ideas? Leaning towards Torque Converter Clutch...

 

car got to shop.. gears engage but will not move.. feels like front pump or tcc nnot building pressure... no visible fluid leaks... stumped part is it just wen out instantly.. customer said drove fine till this morning, no hard shifts, no erratic shifts, no down shift or slips all signs of tcc starting to wear.. just instantly didnt work... any body else ever run into this issue?