4x4 Hum

[danno5069]

I have a 05 sierra z71 with 80000 kms, is it normal to feel or hear a hum when 4x4 and auto 4x4 are engaged. I can feel it thru steering wheel and on floor, almost like a gear to gear feel

[kchasse]

I have a 05 sierra z71 with 80000 kms, is it normal to feel or hear a hum when 4x4 and auto 4x4 are engaged. I can feel it thru steering wheel and on floor, almost like a gear to gear feel

No it is not normal to hear or feel this noise when in 4x4. Mine also does this. I beleive it is either the carrier bearings or it is gear whine. Not really sure but I have driven many other trucks the same as ours and most do not have this noise.

[danno5069]

I have a 05 sierra z71 with 80000 kms, is it normal to feel or hear a hum when 4x4 and auto 4x4 are engaged. I can feel it thru steering wheel and on floor, almost like a gear to gear feel

No it is not normal to hear or feel this noise when in 4x4. Mine also does this. I beleive it is either the carrier bearings or it is gear whine. Not really sure but I have driven many other trucks the same as ours and most do not have this noise.

 

If it is gear whine is it covered under warranty? thnx.

[seadoons]

Mine makes noise and has since the day I bought it brand new. 120,000 miles later and everything still works just fine. It is normal.

[Crazy Canuck]

My Mom has an Envoy that had a whine while in 4x4, turned out to be the bearings in the Transfer Case - $1,200 to fix. My Sierra does not make a sound in 4wd.

 

Crazy

[csheatz]

I think mine hum's also, not really sure if its the 4x4 or the crap on the road i am driving thorugh!

 

I am going to check when i leave for lunch in 20 min!

[J-man67]

It is not normal. It could be the carrier bearing or an incorrect back lash. If you are within your warranty, I would have it check out.

[05silvycrew]

mine's made that noise/feeling ever since I've owned it (at 50,000 miles). I've taken it to the dealer 3 times and every time they claim it's the normal sound of the gears turning. I've got nearly 80,000 miles on it now and nothing has blown yet....but I get a bad feeling every time I put it in 4X4