Forum Discussion

Seamutt's avatar
Seamutt
Explorer
Jul 27, 2014

Allison transmission whine, louder than usual.

I have a 2001 2500 HD 8.1 with the Allison 100,000 miles excellent condition. The tranny has always had a low whine but a few days ago pulled 8000 lbs. up a very steep gravel road that required using the four wheel drive for traction. This was about 1/4 of a mile. the tranny has been making a rather loud whine ever since. Could I be having a tranny oil pump issue.
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  • nremtp143's avatar
    nremtp143
    Explorer
    Jul 29, 2014
    It can be a pump. Mine has done that very thing before. As a precaution, change the spin on filter and top off with fluid. While you are at it, smell the fluid. Does it smell burnt? Is it still pink? The responses above are correct too, it could be the Tcase.
  • danojeno's avatar
    danojeno
    Explorer
    Jul 29, 2014
    Make sure the transfer case isn't dry. They have a wear spot which will lead to a leak and eventual failure.
  • BenK's avatar
    BenK
    Explorer
    Jul 29, 2014
    My guess is transfer case

    When was the last time it was flushed?

    Next to the tranny, so tough to tell which the noise is emanating from
  • Seamutt's avatar
    Seamutt
    Explorer
    Jul 29, 2014
    Not in 4 wheel. Could only hear the whine in neutral but seems to have quit for now.
  • chevor's avatar
    chevor
    Explorer
    Jul 27, 2014
    Make sure its out of 4 wheel drive? Mine is loud in 4 wheel drive.

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