Re: 03 4.7 With NV247 front end droning noise
Not sure if you've worked out the issue or not, but I'd suspect the prop shaft(ps). There s/b no discernible 'play' in both joints. How do they look/feel? If you can make them 'click' by hand now that its out, when under load and spinning they'll make huge racket as they fail.
Also, even though the prop shaft is out, most of the front axle 'gear' is still passively rotating along with the wheels, so if the noise went away upon ps removal, you might have solved the riddle. Note failing props can be so vexing; I too thought the diff had gone 'for sure' the last time as the first time it went was just lots of white noise and rpm related. The last time brought 'deep' grinding and clunking which had me fretting about the ring and pinion and spyders. Was the PS though. Bonne chance!