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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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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.


"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."
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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dave1251 Offline
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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.


make the inside of your engine oil cap white.
don't use.
Re: [cut open] Allison 29539579 spin-on filter for 1000 series trans in Duramax [Re: wwillson] #5212780 09/14/19 09:28 PM
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BlakeB Offline
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This filter is the filter I mentioned earlier, 31,072 miles and 2,073.9 hrs on the truck and filter both.
[Linked Image]
This is the second spin-on filter change from the same truck with 45,922 miles and 3,149.9 hours. (14,850 miles and 1,076 hours on this filter) Along with this filter change I drained the transmission pan and refilled it with 7.4 quarts of Dexron VI. The factory fluid still looked pretty good despite having a lot of hours on it. I'll probably do another spin-on filter change along with another pan drain and refill in another 30-45K miles.
[Linked Image]
[Linked Image]
[Linked Image]
[Linked Image]
[Linked Image]

Re: [cut open] Allison 29539579 spin-on filter for 1000 series trans in Duramax [Re: wwillson] #5240057 10/15/19 09:40 AM
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dnewton3 Offline
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The Alli 1000 is a good trans (made by GM for the light-duty truck applications).

I've seen over 200 UOAs on these units. Fluid type really does not matter much as long as it's a fluid destined for the application. (TES 295 is a full bore PAO syn; TES 389 is the equivalent to the old Dex/Merc fluid. Dex VI also works fine). In short, these transmission are about as finicky as the Dmax engine they sit behind; that is to say, you care far more then the unit does about what oil goes in there.

As for the filters, same goes. Most of these are decent quality from the filter makers. The spin-on filters the oil going to the valve-body in this application. The internal main filter is only required to be changed upon tear-down of the tranny, despite the insistence of the anal-retentive crowd.

Further, pretty much no one qualifies for "severe service" by the Allison definition, but that does not stop folks from over-maintaining their stuff. Don't waste your money; every 50k miles for the oil/filter is more than often enough. I do like to perform a drain/fill and filter replacement after break-in; get out the heavy residuals present from machining and break in. But once that's done, every 50k miles is MORE than often enough.


The act of preventative maintenance, in and of itself, is FAR MORE important than brand/grade/base choices among lubes and filters.
- under maintaining something is akin to abuse/neglect; that can kill equipment by shortening the lifespan
- over maintaining something has never been proven to be anything but a waste of time and money
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