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'98 GMC 4X4 wierd noise help!!!

Discussion in 'Chevy Trucks' started by FLASHMAN, Sep 22, 2008.


    FLASHMAN Member
    Messages: 78

    going down the road, it kind of sounds like one of the auto hubs is engaging/disengaging by itself, but not sure... I get a hum coming from the area of the transfer case... any ideas???
  2. brad96z28

    brad96z28 PlowSite.com Addict
    Messages: 1,526

    The hum maybe coming form a drivershaft support bearing.I dont think reg cab trucks have them. If it has one on ur truck, it can make a noise like that from that area. The other noise I kind of need more info on it. When does it make it all the time or turning ?
    Last edited: Sep 22, 2008

    FLASHMAN Member
    Messages: 78

    Neither, it's random... Sometimes driving in a straight line.... now that I've made it a point to listen to it on purpose, it sounds like it may be a bearing/hub...
  4. tuna

    tuna Senior Member
    Messages: 488

    That truck does not have auto hubs it has a center axle disconnect.I would check the drive chain in the T-case it might be jumping.
  5. SS2500HD

    SS2500HD Junior Member
    Messages: 12

    i would check the muffler bearings, and the blinker fluid