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Old 10-28-2007, 12:05 PM   #1 (permalink)
saladart
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2005 Allison Automatic Transmission Maintenance

I am needing to change the transmission fluid and filter for my 2005 Chevy Duramax Allison transmission. I went to O'Reilly to get a filter and they said there is 2 filters to replace - one is inside the pan and the other is a twist on. The guy didn't know if both filters were needing to be replaced as normal maintenance. Can someone please provide the proper maintenance procedure for this transmission. Also, how much fluid does the transmission take?

Thanks!

Sean
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Old 10-28-2007, 12:42 PM   #2 (permalink)
Raeuber
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Quote:
Originally Posted by saladart View Post
I am needing to change the transmission fluid and filter for my 2005 Chevy Duramax Allison transmission. I went to O'Reilly to get a filter and they said there is 2 filters to replace - one is inside the pan and the other is a twist on. The guy didn't know if both filters were needing to be replaced as normal maintenance. Can someone please provide the proper maintenance procedure for this transmission. Also, how much fluid does the transmission take?
The inside filter is ONLY to be changed when the transmission is rebuild. It is a screen filter and cannot be serviced without tearing the tranny down.
The filter to be changed during normal service intervalls is the spin-on filter. I am not sure about fluid amounts, not sure what year and model you have. Add a signature so people know.
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Old 10-28-2007, 01:05 PM   #3 (permalink)
modified
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For my 2002,
GM recommends replacing external spin-on filter every 25K. Because it’s easy to replace and only cost about $8 at an Allison Dealer, many here replace it more often.
Don’t forget to remove the ring magnet from old spin-on filter, wipe clean, and reinstall on new filter.
The internal filter is recommended to be replaced at rebuild, and again, some believe it’s worthwhile to replace sooner. This replacement is similar to other tranny filters. It is easily accessible by removing pan. The drain plug on the pan eliminates the spills and mess.
If you have the stock pan, draining the pan will drain 7.4 qts from the 12.7 qt system.
If you want to completely flush system, you can do it “The Hoot Method”, linked below:
http://dieselplace.com/forum/showthr...n+flush&page=3
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Old 10-28-2007, 01:13 PM   #4 (permalink)
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Buy OEM Allison filters from a supporting vendor here on DieselPlace.

I change my every 5K since the filters are not expensive and its good for the Ally.

Remember that there is a magnet on the filter. You'll see it either on the filter (inside) or it might stick onto the threads where the filter screws onto. You need to reuse it. Just wipe it off to clean.

I top off the new filter with fluid, attach the magenet, and screw the new filter back on. Your fluid level shouldnt be off that much if you prefill the new filter. Check tranny fluid level after bring it up to operating temp.

For changing fluid, just pull the drain plug and refill with Dex6.
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Old 10-29-2007, 12:04 AM   #5 (permalink)
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I change my Ally filter when the truck is cold. I have my new filter ready with a clean magnet, new fluid in it, crawl under the truck, remove the old filter, clean surface and put on the new one. Two minutes...
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Old 10-29-2007, 12:33 AM   #6 (permalink)
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I think hes talking about the filter when you remove the pan. If your tranny doesn't see much towing, I would replace the internal filter at 50K.
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Old 10-29-2007, 08:49 AM   #7 (permalink)
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Go here for a complete (and down loadable) maintenance schedule of what to do and when to do it:

Duramax Maintenance Schedule
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Old 12-04-2007, 05:04 PM   #8 (permalink)
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Does it matter if I mix brands when I do a quick drain and fill with the Ally? I am not sure what it has in it how since I bought used.
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