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[cut open] Allison 29539579 spin-on filter for 1000 series trans in Duramax #4889368 10/06/18 04:05 PM
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wwillson Offline OP
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This filter is from my 2018 Duramax. This is the original spin-on filter with a total of 8,000 miles. There is a small amount of metal flakes in the filter and only enough clutch friction material to discolor the media. I see no reason to change this filter more often than 25,000 miles. The magnet that mounts between the filter and trans body had a small amount of dark material stuck to it - probably a couple grams.

IMG_3131 - Copy.JPGIMG_3134 - Copy.JPG
Re: [cut open] Allison 29539579 spin-on filter for 1000 series trans in Duramax [Re: wwillson] #4889384 10/06/18 04:25 PM
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Zee09 Offline
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Yeah looks like a long term filter.


"If I walked on water, they'd say I couldn't swim."
Re: [cut open] Allison 29539579 spin-on filter for 1000 series trans in Duramax [Re: wwillson] #4889462 10/06/18 06:49 PM
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My understanding is that most transmission spin-on filters by the OEM are still rock catchers. Better rock catchers than the pan filters, but still around 60-80 microns. That's why I replaced mine with an XG7317.


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Re: [cut open] Allison 29539579 spin-on filter for 1000 series trans in Duramax [Re: wwillson] #4889558 10/06/18 09:10 PM
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bobbobtar Offline
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When I had a 2009 Chevy Duramax with the Allison 1000 transmission I would change the trans. filer every oil change about 10,000 miles cheap insurance.


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Re: [cut open] Allison 29539579 spin-on filter for 1000 series trans in Duramax [Re: wwillson] #4889632 10/06/18 11:34 PM
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Linctex Offline
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Originally Posted by wwillson
I see no reason to change this filter more often than 25,000 50,000-75,000 miles. The magnet that mounts between the filter and trans body had a small amount of dark material stuck to it - probably a couple milligrams grams


There, I fixed all of that for you.


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Re: [cut open] Allison 29539579 spin-on filter for 1000 series trans in Duramax [Re: wwillson] #4893078 10/10/18 03:22 PM
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BlakeB Offline
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I changed the spin-on trans filter on my Dads 2016 LML at 31k with 2073 hours. The magnet had some fuzz on it, but nothing excessive. I haven’t cut the filter open yet, but if I do I’ll post pics.

I checked on Allison’s site and this is what the fluid and filter calculator gave me:

C96566FF-8A59-4933-8C2D-0738751ACD16.jpegA6222260-C39B-407E-935B-02E90F36F89E.jpeg
Re: [cut open] Allison 29539579 spin-on filter for 1000 series trans in Duramax [Re: wwillson] #4893366 10/10/18 08:28 PM
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wwillson Offline OP
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Re: [cut open] Allison 29539579 spin-on filter for 1000 series trans in Duramax [Re: wwillson] #4893373 10/10/18 08:33 PM
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BlakeB Offline
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Originally Posted by wwillson
This filter is from my 2018 Duramax. This is the original spin-on filter with a total of 8,000 miles. There is a small amount of metal flakes in the filter and only enough clutch friction material to discolor the media. I see no reason to change this filter more often than 25,000 miles. The magnet that mounts between the filter and trans body had a small amount of dark material stuck to it - probably a couple grams.


How many hours on your L5P?

Re: [cut open] Allison 29539579 spin-on filter for 1000 series trans in Duramax [Re: wwillson] #4893378 10/10/18 08:35 PM
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wwillson Offline OP
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190 hrs

Re: [cut open] Allison 29539579 spin-on filter for 1000 series trans in Duramax [Re: DoubleWasp] #4900743 10/19/18 10:33 PM
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Originally Posted by DoubleWasp
My understanding is that most transmission spin-on filters by the OEM are still rock catchers. Better rock catchers than the pan filters, but still around 60-80 microns. That's why I replaced mine with an XG7317.



And yet what is percentage of failed transmissions? Not very high.


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