Humming off and on

[FordandPolaris]

I know there are plenty of threads with things related to this, but this is one is odd to me. It just started today. Basically as I hit 70 mph it sounds like a hum is coming from the front of the truck. I was thinking it was my wheel hub going bad, but both were replaced maybe 40,000 miles ago.

The hum cuts in and out, lasting about as long as I can say one onethousand and then stopping for one onethousand. On a side note, as I was driving down my street this morning, I heard a metallic clicking, but it went away after about 100 feet. It has never done that either.

I am thinking that it is the CV joints going bad, but I have always heard that they only make noise when doing sharp turns at low speeds etc. This is in a straight line, at high speeds.

If anyone has any ideas, I am open to suggestions. It is a 4x4, so it could be the front diff, but I am hoping that is not the case. Any advice is welcome, thanks in advance!

 

[Bowesmobile]

I'd put my money on the CV joint. It could be causing a high speed hum as well. Give it a little time and it'll make itself more noticeable.

 

[FordandPolaris]

Yep after doing some more reading it is sounding like the cv joint. Thanks for the input Bowesmobile. I will replace each of them sometime this week I spose.

 

[Bowesmobile]

Yeah, dont want to let them get too bad! Glad I could help!

 

[Explor2Exped]

Is it possible that humming could be the air ride suspension? Mine does the same thing then clicks off.

 

[Bowesmobile]

The pump would have to be really loud to hear it at highway speeds. I can't hear mine when I'm cruising down the highway. But I could imagine if your air ride pump was going bad it making enough noise to hear it at those speeds.