1. Welcome to Tacoma World!

    You are currently viewing as a guest! To get full-access, you need to register for a FREE account.

    As a registered member, you’ll be able to:
    • Participate in all Tacoma discussion topics
    • Communicate privately with other Tacoma owners from around the world
    • Post your own photos in our Members Gallery
    • Access all special features of the site

Loud, rapid knocking coming from rear

Discussion in '1st Gen. Tacomas (1995-2004)' started by breakindrifts, Jun 17, 2009.

  1. Jun 17, 2009 at 9:05 PM
    #1
    breakindrifts

    breakindrifts [OP] Member

    Joined:
    Jun 17, 2009
    Member:
    #18597
    Messages:
    5
    Gender:
    Male
    Help! I really need some input, this is my first taco and I've only owned it for a couple of weeks. I have a base 2WD,auto. And there's loud, rapid knocking/clunking metal on metal noise coming from the rear underneath the bed. i

    The knocking becomes faster as I increase in speed, but it seems to quiet down at higher speeds. It ONLY happens when I'm cruising or on decel, doesn't seem to occur during I'm accel. It's worst at 5-30mph, seems like it goes away at 40+mph. Also, while m in neutral it doesn't knock at all.

    Today after a 35min drive I peeked under and noticed the diff was extremely hot, too hot to touch... Is that normal? My next plan is to inspect the driveshaft, but I wanted to know if you guys have some suggestions of what it might be?
     
  2. Jun 17, 2009 at 9:07 PM
    #2
    tacomaman06

    tacomaman06 Carolina Alliance: Enforcer

    Joined:
    May 1, 2007
    Member:
    #1475
    Messages:
    26,258
    Gender:
    Male
    First Name:
    Will
    York,South Carolina
    Vehicle:
    '16 Tundra TRD Pro
    getting there....
    sounds like the drive shaft....could be the carrier bearing being shot, or the slip yoke worn out.
     
  3. Jun 17, 2009 at 9:13 PM
    #3
    beastlytaco

    beastlytaco This is TW. One never knows what is a joke anymore

    Joined:
    Jun 30, 2008
    Member:
    #7660
    Messages:
    4,042
    Gender:
    Male
    First Name:
    Ian
    Vehicle:
    08 tacoma standard cab
    15% tinted back window, 25% on sides. Jardine catback exhaust system. horn modification, AFE pro dry S filter and secondary filter removed. All weather toyota tacoma mats.
    yeah that sounds alot like drive shaft issues to me
     
  4. Jun 18, 2009 at 6:56 PM
    #4
    snoope

    snoope Well-Known Member

    Joined:
    Jun 13, 2009
    Member:
    #18414
    Messages:
    2,833
    Gender:
    Male
    Ft.myers,FL
    Vehicle:
    2003 Lexus ES300/2004 Lexus 330 AWD
    breakindrifts,

    Have you been under it to look for "Shiny" surfaces,metal on metal leaves true signs.....I too had an eractic noise out back.....one of the 4 caps on the "uni" seeped .......bear to replace..machine shop pressed it out but from there on out.....noise and vibration free...

    I would plan on changing all fluids in areas that got that hot,price of oils and grease = CHEAP PM plus if you use a screen or mesh cloth to drain through.....the results can be eye opening:rolleyes::rolleyes:.and save $$$$ later on...

    Snoope back quiet
     
  5. Jun 18, 2009 at 8:23 PM
    #5
    humanoid

    humanoid bite me

    Joined:
    Jun 27, 2007
    Member:
    #1932
    Messages:
    2,744
    Gender:
    Male
    Sunny SoCal
    Vehicle:
    I had a '99 Xtra Cab PreRunner SR5 V6
    Is the rear diff leaking?
     
  6. Jun 20, 2009 at 10:41 PM
    #6
    TX Tacoma

    TX Tacoma Fightin Texas Aggie

    Joined:
    May 29, 2009
    Member:
    #17768
    Messages:
    94
    Gender:
    Male
    Arlington, TX
    Having a differential being way too hot to touch is not normal. The heat is from insufficient lubrication on the hypoid gears or something like a carrier bearing has gone south inside and you've got metal on metal contact, therefore boku frictional heat. You need to crack open your pumpkin and find out what's gone awry inside. I'm guessing you're going to find alot of metal inside and gear lube that depending on how long you continue to drive it, may smell God awful from coking due to the heat. I would not drive it again till you do investigate what's goin on inside. Whether the gears are stripping out or the bearings are looking to seize, you'll end up stranded once it fails.
     
  7. Jun 21, 2009 at 5:21 AM
    #7
    JonnyReb

    JonnyReb Member

    Joined:
    Jun 10, 2009
    Member:
    #18288
    Messages:
    19
    Gender:
    Male
    N.C.
    Vehicle:
    96 Tacoma,
    Just wondering what you've found BD, My "new to me" taco base model had a dry differential as the result of a wheel cylinder seal leaking. I felt the vibration on the ride home and pulled the plug only to find everything dry and as you noted, hot. Took just over a quart of lucas 75/90 to fill her up and i've not had any trouble since but i was just curious what your trouble turned out to be and how tough the fix is/was. J
     
  8. Jul 6, 2009 at 10:39 PM
    #8
    breakindrifts

    breakindrifts [OP] Member

    Joined:
    Jun 17, 2009
    Member:
    #18597
    Messages:
    5
    Gender:
    Male
    Well finally had some time to inspect the truck and update:

    The noise is definitely coming from the diff. I changed the fluid and the old fluid seemed alright. There was some sparkle, but I didn't notice anything significant in the fluid.

    Up close the noise sounds almost like a chattering, which leads me to believe it might be the pinion & ring gears; but I'm not sure.

    I peeked in the fill hole and couldn't see much, the spider gears do have some markings from where they mesh, but again nothing seemed out of the ordinary.

    Any ideas of what could have gone wrong in the diff? It's really frustrating it's just a damn open diff.

    How much work is involved in removing the diff to inspect it?

    I really appreciate everyones help. Thanks
     
  9. Jul 7, 2009 at 8:37 PM
    #9
    saltbranch

    saltbranch Well-Known Member

    Joined:
    Apr 19, 2009
    Member:
    #16183
    Messages:
    138
    Gender:
    Male
    Tx
    Vehicle:
    1996 2.4,2wd,5spd, stock, 250k
    Sounds like a ujoint from description.
     
  10. Jul 7, 2009 at 8:40 PM
    #10
    breakindrifts

    breakindrifts [OP] Member

    Joined:
    Jun 17, 2009
    Member:
    #18597
    Messages:
    5
    Gender:
    Male

    Thanks for the suggestion, but I already pulled the driveshaft and confirmed the chatter/knocking is something in the differential. :confused:
     
  11. Jul 7, 2009 at 8:45 PM
    #11
    saltbranch

    saltbranch Well-Known Member

    Joined:
    Apr 19, 2009
    Member:
    #16183
    Messages:
    138
    Gender:
    Male
    Tx
    Vehicle:
    1996 2.4,2wd,5spd, stock, 250k
    Did your truck come with limited slip? Is it an ex cab or SWB? Checked carrier bearing?
    The only other thing I can think is a broken ring or pinion tooth.
     
  12. Jul 7, 2009 at 8:59 PM
    #12
    breakindrifts

    breakindrifts [OP] Member

    Joined:
    Jun 17, 2009
    Member:
    #18597
    Messages:
    5
    Gender:
    Male
    Its a base model standard cab/bed 2WD open diff. Yeah I guess it the ring or pinion gears may be damaged. Though I have no idea how that happened, the truck seems to be in perfect condition. My truck has the 7.5" diff right? Sorry noob question.
     
To Top