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Moan...or maybe a Buzz

Discussion in '1st Gen Tundras (2000-2006)' started by athawk11, Aug 30, 2018.

  1. Aug 30, 2018 at 9:11 AM
    #1
    athawk11

    athawk11 [OP] New Member

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    Hello,

    2002 Toyota Tundra extra-cab. 234,000 miles. Dry Colorado climate. I’m the original owner. Has always been garaged. Well maintained. Mostly by me.

    I’ve replaced most of the items that normally wear out. Belts, pulley tensioner, u-joints, brakes, fluids, drive shaft hanger bearing, etc. This has been the most trouble free vehicle I have owned.

    The truck developed a vibration a few years ago. Noticed only at around 70MPH while accelerating, then would go away when accelerating past 74-75MPH and would not vibrate during deceleration. I replaced the drive shaft hanger bearing and the rear u-joint. The vibration was gone for the next 40,000 miles, but then returned. I didn’t have time to dig into it, so I had a shop rebuild the rear drive shaft with all new joints and hanger bearing. The vibration was gone for the first 500 miles.

    It came back, but this time it was different. It wasn’t as much a vibration as it was a moan…or a low buzz. It happens at the same speed (70MPH), but doesn’t go away as the speed climbs past 70MPH while accelerating. Also new is it now moans during deceleration until lower speeds are reached (65MPH or lower), but is quiet as a mouse in that short zone between acceleration and deceleration. This leads me to believe that it’s not a wheel bearing, but I don’t know. I’ve never lost a wheel bearing on any of my vehicles (dry Colorado climate), so I have nothing to compare it to.

    There is enough difference that I’m not sure if I’m still having a driveshaft issue, or this is something different all together. Any thoughts are appreciated.

    Thanks,
    Tim
     
  2. Sep 3, 2018 at 8:08 AM
    #2
    athawk11

    athawk11 [OP] New Member

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    Yep, I'm mystified by this too. :boom:
     
  3. Sep 3, 2018 at 9:04 AM
    #3
    Casper421

    Casper421 Adventure in a 1st gen

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  4. Sep 3, 2018 at 9:05 AM
    #4
    Tierhog

    Tierhog New Member

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    Good description, but thats a tough one. I would create a list of all repairs performed and a second list of maintenance "repairs" and cross reference those lists with the scheduled maintenance book. Would you repack wheel bearings at a quarter of a million miles? I'd say Yes. Any serviceable items that surround the driveshaft that may have been neglected?

    I'm afraid your going to to have to use your reverse engineering knowledge and some labor to find this devious little hide and seek problem.

    *Just read that wheel bearing in non serviceable and generally fail 100-200k
    Don't know that I would take it as gospel, but sounds reasonable.
     
  5. Sep 3, 2018 at 12:25 PM
    #5
    ColoradoTJ

    ColoradoTJ My balls was hot Staff Member

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    Check driveshaft balance, yoke runout, joints could be bad. Have you rotated your driveshaft or reinstalled it in the factory location by marking it?

    Wheel bearings can go anytime.

    Does placing the truck in 4wd help?
     
    Les7311 likes this.
  6. Sep 7, 2018 at 7:08 PM
    #6
    TX-TRD1stGEN

    TX-TRD1stGEN ...

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    Can you tell a difference when you turn left or right (shift weight on by one side or the other) .
     
  7. Oct 11, 2018 at 4:43 PM
    #7
    athawk11

    athawk11 [OP] New Member

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    Good question. No. No changes when the truck weight shifts from right to left. The moan is only there at speeds greater than 70mph. The minute I go from acceleration to deceleration, while above 70mph, the moan goes away...only to return with continued decelerating...until my speed drops below 70mph. Then the noise is gone. Essentially, the moan disappears when there is zero acceleration load and zero deceleration/negative load.

    Thank you all for the responses. I'm still working through this. I don't hit 70mph very often. Denver traffic is horrendous. I'm lucky to hit 50mph in a 65h zone during my commute. That said, I do need to get this fixed.
     
  8. Oct 11, 2018 at 6:41 PM
    #8
    ethan1911

    ethan1911 New Member

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    The rear diff and driveshaft are the two biggest problems I’ve ran into on these trucks, you’ve already checked out the driveshaft so I’d drain the fluid in the diff and if you get more than a thimble full of metal (assuming it hasn’t been serviced in 234,000 miles) id pull the diff carrier and check things there.
     
  9. Oct 13, 2018 at 7:36 AM
    #9
    Professional Hand Model

    Professional Hand Model Fred Brookes

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    upload_2018-10-13_10-36-21.jpg

    upload_2018-10-13_10-36-41.jpg
     
    ethan1911 and 15whtrd like this.
  10. Oct 13, 2018 at 8:15 AM
    #10
    bmf4069

    bmf4069 New Member

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    Ewwww.
     

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