Can anyone help me?

[1971c20]

So just recently my truck is makeing the awful noise coming from what sounds like the carrier bareing, or the rear end. it only makes the noise fro 0-35 and when im taking a right hand turn. the noise sounds like if you took a piece of sheet metal and bend it back and forth with your hands, its that bang type noise. also when i put it in reverse it goes ping and sounds like something is scrapeing whie i back up??? Please help this is my daily driver and i have no idea what it could be. Thanks for any advice.