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Pressure or vacuum build up in rear axle?

Discussion in 'General Tundra Discussion' started by mudsweatngearz, Nov 27, 2016.

  1. Nov 27, 2016 at 2:30 PM
    #1
    mudsweatngearz

    mudsweatngearz [OP] New Member

    Joined:
    Jul 18, 2016
    Member:
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    Male
    First Name:
    Grant
    Arizona
    Vehicle:
    2016 Limited TRD CM 2016, Tacoma TRD Sport, 2005 Tacoma TRD Sport
    Window tint
    I have 17k on my 16 TRD CM Limited. Today I decided to get the break in gear oil out of my rear end and replace with full syn. When I loosened the filler plug there was a hissing sound like opening a cold Budweiser very slowly. Since I dont drink and there was no one else around I surmised it had to be coming from the rear axle. I have never heard a rear end do this before and me thinks this pressure or vacuum could blow a seal. Maybe this is normal for this truck I dunno. I wiggled the cap on the vent fitting and its nice and loose. I have never off roaded this truck and it dont know what mud is so it didnt get plugged by mud..
    Any suggestions or experience with this issue?
     
  2. Nov 27, 2016 at 3:20 PM
    #2
    ColoradoTJ

    ColoradoTJ Certified tow LEO Staff Member

    Joined:
    Feb 24, 2016
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    #2766
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    35,816
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    Colorado
    Vehicle:
    LML 3500HD
    Calibrated Power 5 Tune pack, Allison 1000 tune, PPE deep trans pan, Cold/Hot CAC pipes, Banks CAI, PCV reroute, resonator delete, S&B 62 gal fuel tank, B&W GN hitch
    You're an ass. Now I want a cold beer and have to go into work shortly. ;)

    Your breather vent is not working properly. Several members have done vent mods on here. @csuviper is one of them that comes to mind. I would address this soon.
     
    csuviper and GNTundra like this.
  3. Nov 27, 2016 at 7:42 PM
    #3
    csuviper

    csuviper Moderator Staff Member

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    Broomfield, CO
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    2019 TRD Sport CM 5.7L 4X4
    Some Mods :) See build thread for details
    ColoradoTJ[QUOTED] likes this.
  4. Dec 6, 2016 at 4:27 PM
    #4
    Watercruiser

    Watercruiser New Member

    Joined:
    Oct 23, 2016
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    Chris
    I had mine replaced on my 2010 at about 80K, the dealer did it when it was in for an oil change. They told me if they hadn't replaced it the seals may have failed blowing oil out onto the brake linings. Only cost me 50 bucks. I have a feeling they check it routinely, possibly because it's not an uncommon problem.
     

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