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Allison OEM Discuss repairing & maintaining an OEM Allison automatic transmission.

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Old 03-04-2020, 05:53 PM   #1 (permalink)
Mgriff54
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Confusing info on Allison Transmission

I am getting close to 65,000km and my 2016 Silverado 3500hd and the GM dealer is saying it is time to flush the Transmission fluid. They say all they need to do is hook up a pump and flush it through there system. Is this truly what happens? What about a filter?
I had a 2004 GMC 2500 with the Allison and had the fluid done and replaced the filter but on my 2016 I am hearing different things.
Thanks for insight.

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Last edited by OkDually; 03-04-2020 at 06:28 PM. Reason: prefix
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Old 03-04-2020, 06:28 PM   #2 (permalink)
OkDually
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Thread relocated over to "Allison OEM" for more appropriate answers to your questions



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Old 03-04-2020, 11:41 PM   #3 (permalink)
mike8449
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I was a VW/Datsun mechanic ("Datsun" tells you how long ago that was!) years ago and I have since worked on all my own cars/trucks, but I can't imagine ever changing/flushing ATF without changing the filter(s). If nothing else, I'd want to drop the pan and see what's in the bottom. Hopefully someone more knowledgeable about current procedures will enlighten us.
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Old 03-05-2020, 08:41 AM   #4 (permalink)
Rvn4me
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Quote:
Originally Posted by Mgriff54 View Post
I am getting close to 65,000km and my 2016 Silverado 3500hd and the GM dealer is saying it is time to flush the Transmission fluid.
Well if you read your 2016 Chevrolet/GMC Duramax Diesel Supplement.
Service and Maintenance 11-6
Change automatic transmission fluid and filter. Filter is external on pickups and internal on vans.
156,000 km/97,500 mi

Have you read all the horror stories about Dealer flushing trans? If you like your trans don’t have them do it.
It’s very easy to drain and fill. I change my spin on filter every 15k. Internal filter doesn’t need changing.
There’s hundreds of threads and thousands of post on this.
https://www.dieselplace.com/forum/57...ust-drain.html

Automatic Transmission Service and Maintenance 11-9
DEXRON-VI Automatic Transmission Fluid.
Allison Transmission Only: For areas where ambient temperatures are below -40C (-40F) use Synthetic Transmission Fluid approved to Allison Transmission specification TES-295 (GM Part No. 12378515, in
Canada 88900701).

Last edited by Rvn4me; 03-05-2020 at 08:52 AM.
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Old 03-05-2020, 09:13 AM   #5 (permalink)
Mgriff54
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Thanks for the info
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Old 03-05-2020, 11:45 AM   #6 (permalink)
enahs
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Per Allison, unless something has changed, a non pressurized refill is ok. But do not pressure flush. All that is really necessary is a dtrain and refill and change of the external filter. The internal filter is never changed except at rebuild or if something is trashed in the transmission — or if changing to the deep pan (which requires the deeper filter) It's actually not much of a filter at all. IMO, while you are changing fluid, it is worth changing to a TES-295 fluid, like Mobil Delvac ATF or Transynd.
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Last edited by enahs; 03-05-2020 at 11:48 AM.
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Old 03-05-2020, 02:05 PM   #7 (permalink)
Mgriff54
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Thank you all. I will do a drop.
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Old 03-06-2020, 11:51 AM   #8 (permalink)
enahs
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Quote:
Originally Posted by Mgriff54 View Post
Thank you all. I will do a drop.
Waste of time. But to each his own.
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Old 03-06-2020, 12:43 PM   #9 (permalink)
Ron Nielson
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I believe one of the problems here is communication - specifically what is meant by 'flushing' the transmission. When I flush my transmission, what I am doing is directing the fluid return from the transmission cooler/radiator into a container for disposal, while providing new fluid into the transmission itself and the engine/transmission is doing the pumping. During the process the engine is started and stopped to pump out the old dirty fluid and to provide time to re-fill the trans with new fluid. Many people refer to this as the 'HOOT' method.

Other people refer to 'flushing' as the situation where a machine pumps new fluid under pressure thru a non-running engine/transmission, draining the old dirty fluid and leaving new fluid in it's place. And there have been many reports about problems with this procedure. From what I can tell, the reports are not specific enough about what is actually happening to know whether this 'flushing' is done properly or not.

When someone asks about 'flushing' their transmission, it is important to know exactly how the 'flushing' occurs. I would be very hesitant to let anyone 'flush' my transmission with a machine without knowing exactly how the process worked. I say that only because I have never seen a detailed enough description of the process and actual evidence as to whether it causes problems or not; and if problems do occur, what causes the problems. Anyone ever pre-oil a brand new engine? I certainly do. And what is so different about 'flushing' a transmission versus pre-oiling a new engine (except for old fluid)?

I 'flush' my brake fluid from time to time using a machine, a simple pressure feed of new fluid while draining the old fluid. And I 'flush' my steering fluid in a similar manner. No harm done.

Some people say 'flush' and have one thought in their head, and others say 'flush' and they have something different in their head. And it's often very hard to tell what they are really talking about.
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Old 03-07-2020, 11:49 AM   #10 (permalink)
enahs
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I have not checked Allison recommendations lately, but at one time they noted no pressure flushing. Non pressurized fill was ok. Transmission experts in earlier threads observe that pressurized flush runs the risk of pushing debris into the transmission valve system. Moreover, it's not at all necessary. Simple drain and fill is all that's required.

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