grinding noise when backing up!

[Yukonchad]

I tend to have a grinding noise when I back my 07 Yukon up. Sounds like it's in the rear end. I'm not sure what it is but it's done it since I've bought it. Any ideas? Anyone else ever have something like this?

 

[Ponchonutty]

Mine made similar noise. Was the rear u joint

 

[Yukonchad]

Thanks!

 

[Yukonchad]

That resolved the issue then? Sometimes it doesn't make the sound, but most of the time it does