Help i have a loud crazy noise in the rear end

[kmg73106]

So i have this inconsistent grinding noise in the rear end of my tahoe. I checked the rear axel barrings, and the brake system. All looks fine. The rear wnd is a swap from a 2002 burb. I had backlash issues with the old one. I really can not figure it out, it only happens in drive at parking lot speeds. here is a link to a video. https://youtu.be/0Es9x1NmvrM

Any help is appreciated

 

[kmg73106]

Any body have any idea? It came back the past few days after about 2 months of silence.

 

[Sparky_69]

Holy crap thats crazy! Pop off the rear cover and see is there are any metal shavings in the gear oil

 

[sbubbaklein]

Lets see, is it saw dust or bananas. I forgot.

 

[ccapehartusarmyINF.(ret)]

i cant here the noise yer talkin about of the dam chainsaw in the backround
how did you check the rear axle bearings did you jack up the rear end and check for lateral play

 

[4WDTRK]

That is gnarly! :O

 

[kmg73106]

Changed the gear oil a couple times with the swap i did, and others. The noise really only happens at parking lot apeeds and only after it has been sitting for a while. I have checked for play in all four tires they are all snug as a bug. I am not entirely convinced its coming from the rear end. I wouldnt be suprised if it was coming from the middle. But my drive shaft has no play in it either.

---------- Post added at 09:32 AM ---------- Previous post was at 09:29 AM ----------

More commonly its the same noise but in a shorter duration. Like 1 to 2 seconds. More like a rotaional, but its the same noise

 

[Sparky_69]

Is it a 4x4? Maybe transfer case or transmission?

 

[kmg73106]

Yeah i a 4x4 im going to check maybe change the transfer case oil tonight. if not i might get a new fron qheel bearing.

 

[ezdaar]

Lay down rear seats. Have friend lay across them and hang a cam out the door and as far under the vehicle as possible.
Move cam slow from rear to front while it's making the noise.

Don't be reckless. Just hang arm and cam out..