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Allison dumped tranny fluid??

Discussion in 'Truck & Equipment Repair' started by jgoetter1, Feb 24, 2012.

  1. jgoetter1

    jgoetter1 Senior Member
    Messages: 278

    While plowing, my driver suddenly noticed trans fluid all over the snow. He said he felt no change in the tranny and there were no out of the ordinary symptoms.

    Because it was all over the underside of the truck, it was difficult to determine where on the truck the fluid came from. The fluid level was low but it was still on the dipstick. We got it back to the shop.

    Could the filter have clogged and caused an overflow?

    The truck is a 99 Topkick 7.4 gas, allison transmission. Thanks
     
  2. leepotter

    leepotter Senior Member
    Messages: 122

    Cooler lines?
     
  3. NICHOLS LANDSCA

    NICHOLS LANDSCA PlowSite Veteran
    Messages: 4,310

    No to the filter causing the issue, just going to have to crawl under the truck and look
     
  4. White Gardens

    White Gardens 2000 Club Member
    Messages: 2,665

    If it's not a line, then it sounds like the Input shaft seal is toast.

    One way to figure it out is see if you've got any fluid dripping from the inspection cover.

    ...
     
  5. Herm Witte

    Herm Witte Senior Member
    Messages: 553

    On one of our older Allisons we had a u-joint go bad which caused an issue with the (lack of correct terminolgy here) casting that bolts to the output of the transmission. Trans fluid all over the place. Never noticed the u joint vibrate. FYI, over 160k on the truck and still original transmission.
     
  6. jgoetter1

    jgoetter1 Senior Member
    Messages: 278

    Thanks for the replies - what's odd is that there hasn't been any leaking since the incident. That's why I thought something caused an overflow.
     
  7. csi.northcoast

    csi.northcoast Senior Member
    Messages: 320

    depending on the tranny look for the vent, should be on top of the trans toward the rear, it that gets plugged you could have that issue, one of my truck the vent was plugged and it threw up out the dipstick tube