Replying to CRV Diff Squeak

So ever since this past summer my 2001 Honda CRV has been having an issue with the diff, whenever my I spin my tires on dirt (doing a mad drift) theres a consistent squeaking noise that seems to be coming from my differential. I just got it back from my mechanic and he said he changed the diff fluid but I just got back and tested it and it still squeaked, he said we might just have to change out the whole diff, curious if anyone has an idea as to what it could be.