I have a scraping noise that starts at 35-40 mph and stays constant, but when I put it in 4wd hi the noise goes away under power till I coast, and when I take it out of 4wd the noise resumes, I have Replaced the Cv Shafts on both sides and transfer case but the noise still starts at 35-40 mph and gets slightly louder the faster I go, I'm begining to be at my wits End

 

I dont know much about a 4wd but here is a free bump to help you out.

 

Thanks Weedahoe, got it way narrowed down to the front diff after I put only the outer cv cups in and went for a drive, no noise, stopped put in 4wd and there the noise was... kinda sucks, put alot of money into the cv's and transfer lol

 

Find HammerZ71 on here and see if he can maybe help