Pretty hard to explain, but ive noticed (maybe when its colder) when I start my truck in the morning and reverse or go forward (either one) ill get a rubbing/rotational kind of noise, but pretty much goes away as soon as I give it gas pass 10mph and thats it... I wont get it it all until the next morning.... Anyone get the same thing? It kinda feels like the drive shaft but that was checked a month ago and its good, remember, I never get this noise afterwards, its like I have ice buildup in the drive shaft that clears away once I drive.... thats not the case though

 

Tires gently flat spot overnight, maybe, and the colder weather takes just a bit longer to bounce back than in the warmer weather?