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Roaring problem 01 Silverado

This is a discussion on Roaring problem 01 Silverado within the Technical / Maintenance forums, part of the General Discussion category; I have acquired a loud roaring noise in my truck recently. It is noticeable around 30MPH, then quits until you ...

  1. #1
    Supporting Member bigkountry's Avatar
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    Roaring problem 01 Silverado


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    I have acquired a loud roaring noise in my truck recently. It is noticeable around 30MPH, then quits until you reach 60-70 MPH. I have check just about everything I can think of. It does not do this when it is in neutral and revved up so it leads me to think it is drivetrain related.

    It only does this while roling, not at idle or sitting still with the revs up. There is no rough ride whatsoever, shimmy or anything.

    I have never came across anything like this and it has me stumped.

    I can only think of a few more things that could cause it.

    Universal joints/carrier bearing (both look to be in good shape)
    Front wheel bearing
    Rear wheel bearing
    Brake pad rubbing
    Tires roaring (they only have 3,000 miles on them)

    Heres the kicker, it just happened one day going down the highway @ 70mph adn it has been there ever since. Sometimes it doesn't roar but most times it does.

    If anyone can help me out it would be appreciated. I would hate to spend the money for new uni's, and axle bearings if it's something small.

    Thanks

  2. #2
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    Re: Roaring problem 01 Silverado

    Where does it sound like it's coming from?

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    GMC RULZZ NEUMANNZZ's Avatar
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    Re: Roaring problem 01 Silverado

    is it coming from the front my fan clutch does it every once in a while.
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  4. #4
    Supporting Member bigkountry's Avatar
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    Re: Roaring problem 01 Silverado

    Actually it does sound like it's coming from the front.

    I thought it might be my axle roaring so I just got done changing the gear oil and test drove it... it's still there.

    I took the front wheels off and no play or indication of a bearing going out and my brakes/rotors look fine too.

    I thought it might be a cab seal leaking but it does it with the windows down as well.

    I'll check the fan to see if it might be going out, it sounds like a 747 jet when I first start it up...lol

    Thanks for the help this far, anyone else have any insight or ideas?

    I don't know if any of you have "storm sirens" in your town but that is what the sound is comparable to.
    Last edited by bigkountry; 10-02-2006 at 02:35 PM.

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    Re: Roaring problem 01 Silverado

    sounds like fan clutch.
    my truck is a turd, and i sold my z28.

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    Re: Roaring problem 01 Silverado

    Yeah, Dad had a roaring in his '96 for several years and it didn't really seem to affect anything... and it went away after he replaced the fan clutch.

    - Russ

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    Re: Roaring problem 01 Silverado

    If it is the fan clutch you will also see a drop in fuel mileage and power....my money is on the fan clutch. Even if the fan is not locked up check the front of the clutch for oil leakage and especially the spring on the front of the clutch to see if it is mising or disconnected.

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    Re: Roaring problem 01 Silverado

    I'll be replacing mine with an electric soon, it's like 25+ free HP!
    my truck is a turd, and i sold my z28.

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    Re: Roaring problem 01 Silverado

    Are you going to keep your clutch after youy make the change?

    I'd like to try a different clutch on my 2001 6.0 Vortec to see if it cures my A/C cycling problem, but I don't want to buy a new one just for an experiment.

    As far as that goes, anybody know if the fan clutch off a 1988 350 would work on a 2001 6.0 Vortec? I have one that has just been sitting around, it's probably good.

    - Russ

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    Supporting Member bigkountry's Avatar
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    Re: Roaring problem 01 Silverado

    Thanks for all the input, I'm gonna pull the shroud today and check the fan out. This might be a good excuse to upgrade to the electric fans wihout so much flack from the wife...lol

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    SLACKIN' CARLISLE BISH Jokeman's Avatar
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    Re: Roaring problem 01 Silverado

    Clutch Fan.
    Last edited by Jokeman; 10-03-2006 at 06:53 AM.

    If its loud, fast and runs on flammable liquid......count me in.
    Built LQ9...blah blah blah

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    Supporting Member bigkountry's Avatar
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    Re: Roaring problem 01 Silverado

    Ok, I just pulled the shroud and checked the fan clutch out. Everything seems to be in working order as far as I can tell.

    It still has some resistance while turning it, the spring is still seated. The only thing I saw that might be a concern is the spring is not under any pressure and is actually loose in the housing and I can move it in and out a little.

    I did not see any oil leaking from the clutch anywhere, but I did not remove the fan itself due to me working tonight.

    Would the loose spring be a problem? My truck is real loud when it is first started up from sitting for a while (when engine is cold). I'm used to running aluminum fans on my other trucks so this is new to me...lol

    Thanks

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    Re: Roaring problem 01 Silverado

    If it was the fan clutch it would do it setting while in neutral with the engine rev'd up. Take it out on the high way and get into the zone that it makes the noise, then shift the truck up into neutral and let off the gas. If the noise is still there, it's a wheels and tires issue. If it goes away its an it's a drive line issue. (balanceer,torque converter, tranny ect)

  14. #14
    Supporting Member bigkountry's Avatar
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    Re: Roaring problem 01 Silverado

    OK, just took it out for a drive. I got it up to the speed that it makes the sound at, put it in neutral and let off the gas....it still does it.

    I have aftermarket wheels and Goodyear Fortera tires on it (stock size), wonder if the tires are the culprit?

    One more question that was brought up by my wife, could it be caused by my cowl hood? I woud not think so due to it making the sound at lower speeds as well, but I don't really know.

    Thanks

  15. #15
    Supporting Member bigkountry's Avatar
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    Re: Roaring problem 01 Silverado

    I also noticed that I have a very slight pulse when I am coming to a stop, like maybe a rotor is a bit warped.

    Do any of you think this might be the culprit to my mystery noise? Maybe the brake pads are rubbing on the rotor?

    When I am coming to a stop and it is making the noise, it does go away when I apply the brake after a few feet.
    Last edited by bigkountry; 10-09-2006 at 01:22 PM.

  16. #16
    Registered User battmain's Avatar
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    Re: Roaring problem 01 Silverado

    When the NBS trucks came out, a lot people put on the hood protectors to protect the paint on the front of the hood. They caused the noise you describe.
    Now that you mention cowl hood, it's a possibility.
    Last edited by battmain; 10-10-2006 at 05:15 PM.
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    Rocket Scientist Stealthdump's Avatar
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    Re: Roaring problem 01 Silverado

    ...isn't that "spring" on the clutch really a bimetal thermostat coil that you shouldn't be fumbling with?
    '04 Silverado ext.cab 3500 4X4 6.0L Stealth Dump Kit
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  18. #18
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    Re: Roaring problem 01 Silverado

    I just put a new fan clutch in my 2001 1500 HD today.

    My A/C would sometimes blow hot when I was sitting still or moving very slowly, and some said it could be the fan clutch. And this clutch was very loose - I could see that the fan blades weren't moving very fast at all when I had the engine running. And it was supposedly the "Severe duty" one, judging by its size in relation to the NAPA replacement.

    Anyhow, hopefully that problem is cured. I think I also fixed another thing as well. When starting to drive away from a stop, I would hear this ridiculous tinny rattling sound, which I thought must be a rattling sheet metal guard or something like that. Very aggravating. Well, with the new fan clutch, that noise is gone! And I can hear new noises from the engine compartment.

    So no telling what all changes in sound a fan clutch may make.

    - Russ

  19. #19
    Rocket Scientist Stealthdump's Avatar
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    Re: Roaring problem 01 Silverado

    Damn Russ, are you following me around? Joke

    Last time I heard a tinny rattling noise like that my driver side motor mount was broken and the fan was hitting the shroud.
    '04 Silverado ext.cab 3500 4X4 6.0L Stealth Dump Kit
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  20. #20
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    Re: Roaring problem 01 Silverado

    Yowch! I will keep that in mind, for sure.

    - Russ

 

 
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