Rattling sound when in reverse - Problem

[napp e roots]

When i put my truck into reverse it starts making a rattling sound. Seems like its coming from the transfer case or maybe rear end. It only does it in reverse. There are no leaks the axle didnt seem loose, there is no other noise when driving. Any thoughts

Thanks

2001 Tahoe LT

 

[Gzes]

Does it still do it when brake is pressed or when you let it go back

 

[napp e roots]

ya its still there when i press my foot on the brake, it happens while sitting still or moving and even rolling back with my foot on the brake while rolling out of my drive way