i did a burn out like 2 days ago and after that there's a humming sound from the differential i think. i have 4.56gears and i don't think it was as loud as now. what do you think happened?

 

Well if it sounds different, then you've probably gotten a "pwnd!!1! Diff"

Was it reinforced?

Apparently you haven't asked anyone to help diagnose it, that should be your first step. A bunch of guys 100's of miles away can't give you an answer with the info provided.

Try getting a friend to help determine where the sound is coming from.
If you determine it's the Diff.

Change your Fluid and see if you have any metal chunks.

 

ok, i will get this diagnosed by a mechanic. today i changed my differential fluid and there was no peices of metal coming. so i don't know what it could be.