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Technical Oops, Dot 3 in a TH400 ?

Discussion in 'The Hokey Ass Message Board' started by Bird man, Sep 1, 2020.

  1. 1ton
    Joined: Dec 3, 2010
    Posts: 429


    I just bought an older, but not Hamb friendly, pickup from a guy. Truck is decent but the auto trans is bad. The seller told me that his kid put engine oil in the tranny. It still moves but barely. I've decided to do my very first rebuild of an auto trans. Confidence and Youtube will get it done.
  2. Beanscoot
    Joined: May 14, 2008
    Posts: 1,694


    I don't see why engine oil would harm an auto trans, try flushing it and refilling it with proper ATF before removing it.

    But then why did he add the oil in the first place? Maybe it was out of fluid and damage was done already.
    Blues4U likes this.
  3. gimpyshotrods
    Joined: May 20, 2009
    Posts: 17,896


    That may be true where you live, but remember, operations costs vary by location, even when you just consider rent and prevailing wages.

    Also remember, you are paying not just for time, you are paying for the decades of experience in building complex hydro-mechanical devices, to the level that they can be operated in extreme conditions, for hundreds-of-thousands of miles, with minimal maintenance, and no call-backs. Plus, you get live, local Humans for support, when you need it.
    Blues4U and Truckdoctor Andy like this.
  4. dan c
    Joined: Jan 30, 2012
    Posts: 2,171

    dan c

    we used to recycle our oil at the shop where i worked. only one big no-no!
  5. jaracer
    Joined: Oct 4, 2008
    Posts: 605


    Okay, it has been a while and I did put a transmission clutch pack seal in some DOT 3 brake fluid. Contrary to what I believed, it appears that the seal did swell ever so slightly and is much more pliable. It looks like it might have grown 1/16 of an inch in diameter. I wonder if the same thing would happen if I just soaked it in ATF. That's my next experiment.

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