High Pitched Whine From Behind Cab

[Iplayfarmer]

I'm hearing a high pitched whine coming from my truck. It only happens when the truck is has driven for a half hour or more, and it seems louder the mroe I've driven. It sounds like it's coming from between the cab and the bed.

Any ideas what would cause this?

 

[jayste]

Farmer, carrier bearing on the driveline? Only whines when it gets hot?

Jay

 

[kennyd]

What truck?

My first guess is the intermediate carrier bearing that supports the driveshaft half way between the tranny and the differential.

 

[Diamondpilot]

I would agree with checking the carrier bearing first. When it starts to whine get out and feel it, if hot thats your culprit. Could also be a U joint but they usually clunk.

My neighbor just had to have the CB replaced on his 07 DMAX but it was not making noise, just vibrating the truck pretty good.

Chris

 

[Iplayfarmer]

Sorry, I should have added more detail. It's a '99 Chevy Silverado 1500. I hear the whine when I get out while the truck is running. In other words I hear it when I'm parked. It's probably whining all the other times too, but I'm in the cab and so I don't hear it.

I'd think that rules out the carrier bearing.

 

[Diamondpilot]

If its a stick check the throw out bearing. Oh wait, I that whine comes from all GM trucks around here. Its the owners. LOL. Just had to poke fun. Hope there is no hard feelings.

In all seriousness, I think its tranny related, and like I said if its a stick probably the throw out bearing.

Chris

 

[Dargo]

In all seriousness, I think its tranny related, and like I said if its a stick probably the throw out bearing.

Chris

Do you know how bad of a feeling you get when, right after changing a clutch, you plop down in the driver's seat to start the truck and you notice the throw out bearing sitting in the passenger seat? Oh man, that is almost enough to make a grown man cry....right after lets loose with some choice words.

You can check to see if the throw out bearing by seeing if it makes that noise when you just rest your foot on the clutch while sitting still idling. A carrier bearing is much easier to change and they make a noise that sounds like it comes from between the cab and bed. A carrier bearing won't make a noise while sitting still though. If it only whines when moving I'd check the carrier bearing first. If that's not it, check U joints and then rear end.

 

[davkir]

Sorry, I should have added more detail. It's a '99 Chevy Silverado 1500. I hear the whine when I get out while the truck is running. In other words I hear it when I'm parked. It's probably whining all the other times too, but I'm in the cab and so I don't hear it.

I'd think that rules out the carrier bearing.

In that case I would take a look at the power steering pump or alternator. Have you tried listening with the hood open?

 

[clundog]

My 98 Chevy's electric fuel pump makes a fairly high pitched whine. Put your ear down by the tank and see if it's from that area. Also if you cycle the key you may hear it. I've been told this is an indicator that the pump is about to give out, mine has done this since it was new!

 

[Diamondpilot]

My 98 Chevy's electric fuel pump makes a fairly high pitched whine.

Good thought. On those trucks they are in the tank. Easy to change. Just did one on a neighbors sons truck this spring. Just pulled it up on ramps with tractor, all 4 wheels. Borrowed a extra set of ramps, I only have 1 set. Put a jack under the tank and get a guy to stabilize it while you loosen the 2 straps and the filler neck. With it on ramps you can sit Indian Style and work.

Once dropped down on the ground the fuel lines and electrics are long enough to reach, you mark everything and then undo it all. Pull the tank from under the truck, change the pump, then reinstall. The only specialty tool is the fuel hose removal tool, $5 from Auto Zone. Took 1.5 hours but I had helped do this job before on my brother-n-laws old GMC.

Chris