Water crossings with an automatic transmission




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  1. #1
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    Default Water crossings with an automatic transmission

    I saw a video on YouTube where an adviser warns against water crossings with an automatic transmission. He pointed to a component on the gearbox casing which is a breather device. He said if that part gets submerged water will be sucked into the gearbox destroying it.

    I know breather pipes are standard fitments on diffs of 4x4's. I guess the same applies to gearboxes.

    What about 2x4 bakkies. Are they also sold with factory fitted breathers? I think not, because I had a gearbox failure on a 2x4 manual transmission after negotiating deep water during flooding in the Kgalagadi.
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  2. #2
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    Default Re: Water crossings with an automatic transmission

    IMHO every gearbox (manual or automatic) is to have a breather of sorts for simple reasons of heat dissipation and consequent expansion of internal air volume.

    The only question is, if the breather intake is raised to prevent it being submerged when the vehicle is in deep water.
    This regardless of being a 4x4 or a 4x2.

    Best option to check it out on a dry day by crawling underneath with a good torch.
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  3. #3
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    Default Re: Water crossings with an automatic transmission

    Look in your owners manual and it will tell you the wading depth of your vehicle.
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  4. #4
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    Default Re: Water crossings with an automatic transmission

    Ek het baie water kruisings met my Prado gedoen en geen probleem nie

  5. #5
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    Default Re: Water crossings with an automatic transmission

    Breathers work exactly the same for manual or auto. Just make sure it is routed higher than your air intakes into the engine bay and it will be fine.
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  6. #6
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    Default Re: Water crossings with an automatic transmission

    Have a 4L80e auto in my Landy breather is situated high up and with a filter on it and never had a problem, As long as breathers on gearboxes, diffs, autos, fuel tanks are higher then what going throug there will not be a problem
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  7. #7
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    Default Re: Water crossings with an automatic transmission

    Quote Originally Posted by Stephan van Tonder View Post
    Breathers work exactly the same for manual or auto. Just make sure it is routed higher than your air intakes into the engine bay and it will be fine.
    Quote Originally Posted by clivemd View Post
    Have a 4L80e auto in my Landy breather is situated high up and with a filter on it and never had a problem, As long as breathers on gearboxes, diffs, autos, fuel tanks are higher then what going throug there will not be a problem
    Check regularly that all pipes are properly fitted and in good condition. Once submerged and box cools it will suck in air at the first opening in line and if cracked, water will be sucked in
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