Sudden Noise development

[Ron Gering]

Went fishing yesterday and everything was normal.  Got to the truck and when I was leaving I herd a Whining noise. Didn't think much about it until it didn't go away. Now it's got me worried.  Doesn't do it in park or natural,  only while moving. Seems to start around 2k or 15 mph. If ur at a standstill (in park) and Rev the engine (2k or so) there is zero noise. But as soon as u get to mentioned speed it starts. Gets even louder under heavy excelleration. Just had the oil changed but didn't think that would cause it. Any ideas or thoughts would be greatly appreciated.  Oh it's a 23 silverado with the 2.7 and 12k in miles.

 

Tnks all

[silveradosid]

you got warranty take it in. could be diff's or transmission. does the noise change in 4 wheel drive

[Ron Gering]

I haven't tried that honestly.. did notice this morning on my way to work that it seems to be the loudest at 2k or when heavy on the gas. I forgot to mention I was a tad over on my last oil change.. could that have something to do with it.  Will add that the tech doing my oil said the transfer case is leaking. 

[Ron Gering]

Same noise in 4wd