4x4 making loud noise

you could possibily have a high spot on your pinion gear

that is a part in the differential right?

Yes it is

well I just had that entire unit replaced with a new one also I had my transfer case replaced the entire unit. the noise is still their

also the sound is coming from the front driver side wheel if that helps at all

Then you prolly have a bad hub

ok guys thanks but I also had all of my wheel bearings replaced brand new. this is why im having this huge dilemma. I have been going to several auto shops including ford dealer, and all the things you guys are telling me I had done already because they said the same things

and yet I still have the same loud noise coming from the front end driver side

how about making sure that the transfer case has enough gear oil in it

I'm having the same issue. Did you find out what it was?