Missing rear differential fluid?
 

Twice now I have had to add fluid to my rear end of my 94 f 150 4x4. There are no leaks from the pan, nor is it wet looking, nor at either wheel. Any Idea where the fluid is going?
???Confused???

Is it wet around the pinion seal? Sometimes the seal goes bad and the lube gets pulled up the pinion shaft and out the seal. Then is slung off. Look for fluid slung onto the underside of the box.