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  1. #1

    Unhappy 98 Suburban - MUCH noise between 55-68 mph

    I have a 98 Suburban, 4WD, 5.9 V8. approx 118K miles. I love the truck, but when accelerating between 55 and 68 mph there is a LOT of noise from the vehicle in the cabin. When I get past 70, the noise goes away and also if I let off the gas the noise continues for about 3 seconds and then stops (regardless of MPH).

    Any ideas are greatly appreciated. One garage told me that my Kelly tires could be causing this as they were wearing unevenly...

  2. #2
    Jr. Engineer
    Join Date
    Feb 2007
    Location
    Edmonton, Alberta, Canada
    Posts
    298

    Default

    what rpm range? could be lifters or an imbalance in motor.....

  3. #3

    Default noise

    Quote Originally Posted by bboyd View Post
    I have a 98 Suburban, 4WD, 5.9 V8. approx 118K miles. I love the truck, but when accelerating between 55 and 68 mph there is a LOT of noise from the vehicle in the cabin. When I get past 70, the noise goes away and also if I let off the gas the noise continues for about 3 seconds and then stops (regardless of MPH).

    Any ideas are greatly appreciated. One garage told me that my Kelly tires could be causing this as they were wearing unevenly...
    Crank shaft.

    I hope I'm wrong.

    Technology is great, when it Works,
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    94 GMC Burban, 5.7L (350), 4X4, Auto
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  4. #4

    Default

    What kind of noise is it, a whine, a rattle or what? Does it include any vibrations?
    Gary

    99 K 1500 Suburban
    78 Silverado Big 10 w/factory 454
    00 S-10 Blazer
    1976 Trans Am
    1980 Honda CB900 Custom

  5. #5

    Default Noise

    There is definitely some vibration. The noise sounds like really loud road noise, and goes away when I left off the accelerator or accelerate over 70/below 58.

    If it is the crankshaft as one of the other posters said, what does that involve for estimated repair costs?

  6. #6
    Jr. Engineer
    Join Date
    Feb 2007
    Location
    Edmonton, Alberta, Canada
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    298

    Default

    Quote Originally Posted by bboyd View Post
    There is definitely some vibration. The noise sounds like really loud road noise, and goes away when I left off the accelerator or accelerate over 70/below 58.

    If it is the crankshaft as one of the other posters said, what does that involve for estimated repair costs?
    if its the crank your are looking at a complete rebuild... really no other way.

    1993 K1500 Suburban 350TBI, 378,486KMS on frame, 49,000KMS on Drivetrain. Lots of mods, built for haulin trailers and haulin @$$ :)

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  7. #7

    Default Other question

    Is it possible that this could be caused by bad shocks? I've changed the front ones since purchasing the truck, but don't know if the back ones have ever been touched...

  8. #8

    Default

    One of the first steps in diagnosing noises is to try and determine if it's engine or drivetrain related. You say the noise seems most prevalent between 55 and 68 mph. Assuming that's in 4th gear, the next thing to do would be to put the transmission in D (so it won't shift into 4th) and see if the noise occurs at the same vehicle speed or at the same engine speed (a slower vehicle speed). If the noise seems more related to engine speed, then start looking at engine related things (fan clutch, misfire, exhaust noise, etc.). If it seems more related to vehicle speed, then check things in the rest of the drivetrain (u-joints, suspension, tires, etc.).
    '98 K1500 Suburban LS 5.7 L 4L60E NV246 ARB
    '92 Ford Explorer XLT 4x4 4.0 L A4LD BW13-54 Trac-loc rear
    "My toys were the greasy cogs and springs and pistons that lay around all over the place, and these, I can promise you, were far more fun to play with than most of the plastic rubbish children are given nowadays." Danny in Roald Dahl's Danny The Champion of the World

  9. #9

    Default

    It's hard to say w/o hearing the noise. I've had speed-related noises be everything from out-of-balance wheels to ... yes a damaged crank in a 350.

    Shorty is right, definately try to rule out the tranny. That speed range could be when you shift into 4th gear and you may have a bad 4th. Try that first.

    Is the noise louder with the windows down? Do you feel vibration, espectially anything coming up through the brakes or the steering column?

    Steve
    10 Chevy Traverse LT AWD
    02 Chevy Trailblazer LS (110K+ miles - loaded except for 4WD - WRECKED!)
    99 Chevy Cavalier LS (105K+ miles - commuter car)
    78 Chevy Suburban Silverado (454, 3/4 ton)
    62 GMC 3/4 ton Pickup (350 police interceptor)

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  10. #10

    Default Thank you!!

    I will try the items listed by Shorty and report back to the forum. I appreciate all of the responses!!!

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