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Vibration from rear end at 45mph

Discussion in '2nd Gen. Tacomas (2005-2015)' started by whitebread, Feb 19, 2010.

  1. Feb 19, 2010 at 6:02 AM
    #1
    whitebread

    whitebread [OP] Well-Known Member

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    Chris
    Raleigh, NC
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    2011 4x4 DCSB TRD Off-Road
    Leer 100XL and a bunch of off-roading scars.
    I was hoping you guys could lend some input. I have been experiencing this issue for the past 5k miles. When driving in 5th gear between about 42mph and 46mph (~1600 RPM?) there is a shaking coming from the back end that can be felt in the seat.

    • Put the truck in neutral and it appears to disappear a few seconds after, but not immediately.
    • Had the tires balanced and it didn't help any.
    • I don't recall experiencing this before having the suspension TSB.
    • It appears to be more prevalent when the truck is cold.
    • If briskly accelerating through the problem speeds there is no vibration felt.
    • On some road surfaces you can't feel the vibration.
    • I have adjusted tire pressures in both directions and it didn't make much difference.
    I was planning on installing my lift tonight and having my tires put on tomorrow, but I am a little worried about the dealer blaming the lift...so I want to get this issue resolved first. The dealer will be checking it out on Tuesday, but to be honest, I have very little faith in them so I want to gain as much information as possible.

    My next step is to measure drive-shaft angles, but with a stock suspension it doesn't make sense that would be the cause.

    Any input is greatly appreciated.
     
  2. Feb 19, 2010 at 6:41 AM
    #2
    Sack17

    Sack17 Well-Known Member

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    The only thing I could think of, and keep in mind I'm no mechanic, but I would try and check the nuts on the rear U bolts. Maybe they didn't tighten them tight enough which is causing the vibration.
     
  3. Feb 19, 2010 at 7:29 AM
    #3
    whitebread

    whitebread [OP] Well-Known Member

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    Leer 100XL and a bunch of off-roading scars.
    Good thinking...that didn't cross my mind.
     
  4. Feb 19, 2010 at 9:16 AM
    #4
    SpaceMonkey

    SpaceMonkey Well-Known Member

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    So the only change was the TSB leaf springs done by the dealer? If so, take it back and get it fixed. It could be loose u-bolts or the leaf springs are not seated correctly.
     
  5. Feb 19, 2010 at 9:28 AM
    #5
    Mark C.

    Mark C. If you want it bad, you usually get it bad!

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    x10!
     
  6. Feb 19, 2010 at 10:08 AM
    #6
    aficianado

    aficianado Well-Known Member

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    back to bone stock.
    u-joints.
     
  7. Feb 19, 2010 at 11:03 AM
    #7
    whitebread

    whitebread [OP] Well-Known Member

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    Chris
    Raleigh, NC
    Vehicle:
    2011 4x4 DCSB TRD Off-Road
    Leer 100XL and a bunch of off-roading scars.
    I did check the leafs and they appear to be seated correctly. I did not check the torque on the nuts.

    aficianado, I too am wondering about the u-joints.
     
  8. Mar 3, 2010 at 4:54 PM
    #8
    whitebread

    whitebread [OP] Well-Known Member

    Joined:
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    Messages:
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    Gender:
    Male
    First Name:
    Chris
    Raleigh, NC
    Vehicle:
    2011 4x4 DCSB TRD Off-Road
    Leer 100XL and a bunch of off-roading scars.
    So the dealer said it was the "firm ride" they warned me about before putting on the TSB spring pack. I thanked them for their time and left still wondering what was causing the vibration.

    Anyway, installing my lift fixed it. I didn't use the rear shims or bearing drop either. Maybe it was the new tires, alignment, or re-torquing everything; who knows. I am just glad it is fixed.
     
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