enjoy425

I have Z71 4X4 2006 Sieera SLE 1500,I have a noise in the front end of the truck,it's hard to describe the sound ,but it sounds like a flat tire sound or a woo sound but not loud.The noise starts when you hit 50mph and the noise never gets any louder,no vibrations ,no whining noises,just a dull sound that drives you nuts it sounds like it is come from the passenger side,and if you go below 50mph you don't here it anymore.Had it at a transmission place and they took it for a drive and its not the transmission and the put it on the hoist and lifted all wheels of ground and put it into 4x4 and heard nothing ,it just happens under a load or wieght of the truck,and took it to a front end men and he said it didn't sound that serious ,said it wasn't the wheel bearing hubs,he said drive it till it gets worse that was 3 months ago and the noise is still there and no louder,it bugs me knowing what the noise is,we also moved the wheel left to right and right to left and the noise was the same never changed,any ideas
thanks
Gary

EvansBlue

Sounds like a bearing in the differential or the transfer case. Could also unevenness in the tire. Rotating them can rule that out.

enjoy425

I have roated the tires and the noise is still there it seems to come from the left front ,when it is in 4x4 the noise isn't there
thanks