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What caused my Rear Axle Seal to go? Synthetic Diff Oil?

Discussion in 'Technical Chat' started by james, Jul 22, 2011.

  1. Jul 22, 2011 at 10:19 AM
    #1
    james

    james [OP] In over my head...

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    I took my truck off-island yesterday to get it aligned after my OME lift. I just arrived from Alaska, where I carried FAR too much weight... Preliminary inspection after I took the weight off the truck showed that I didn't blow out the rear axle seals. That was 1000 miles ago. The truck was fine until I took it up to highway speeds. (nothing faster than 45mph where I live).

    About 6000 miles ago, I switched out my fluids, including the rear differential fluid to synthetics. At the same time I put on a rear differential breather hose for me... Garden Hose and clamp...

    And yesterday, when I got the truck up to 70 mph for the first time in... goodness...at least 5000 miles, my left rear axle seals gives out, soaking my break shoes in the process. Dang.

    After using the search feature, I've learned that they can go out for a variety of reasons...

    1. Worn out wheel bearings
    2. plugged rear diff breather
    3. And now this: a Tundra TSB: DL003-03 that says that 2000-2003 Tundras/Sequoias have a seal design that causes it to go if you use synthetic oil.

    Could that apply to my '98 Tacoma? How long would it take for the wrong chemistry to cause a seal to fail?

    Question: can I get away with doing only the left (blown) side? How will I know if the bearings are shot?

    This never comes at an easy time, does it? I gotta load the thing back up with 2000 lbs and head back to Alaska in a week to teach... grrrrrr....
     
  2. Jul 22, 2011 at 11:14 AM
    #2
    BlueT

    BlueT Well-Known Member

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    Unless you put some wierd acid laced diff fluid there is no way oil will cause your seal to fail. So it was not fluid that did that.
    Either it was its time to fail or your bearing is dead and after you loaded truck seal could not cope anymore.
    Yes you can change only one side but since you need to do all that work you may as well just replace both of them.
     
  3. Jul 23, 2011 at 3:01 PM
    #3
    james

    james [OP] In over my head...

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    It turns out that TSB DL003-03 *does apply*. Copied from another site (Tundra Solutions: http://www.tundrasolutions.com/forums/sitemap/t-19826.html:

    Hmmm.... does anyone have any experience with this?
     
  4. Jul 23, 2011 at 3:08 PM
    #4
    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

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    1. TSB's are only covered during warranty periods.
    2. I ran Amsoil severe gear in my 98 (tranny and rear) without issue.

    I highly doubt synthetic oil caused your issue.
     
  5. Jan 27, 2012 at 6:09 PM
    #5
    tan4x4

    tan4x4 Well-Known Member

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