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#4495590 - 08/22/17 08:46 PM Transmission Fluid Temperature
Spudislander Offline


Registered: 10/01/06
Posts: 58
Loc: Canada
I have a 2017 GMC Canyon V6 with towing package. Included in the vehicle information system display is the automatic transmission fluid temperature. However, the owners manual doesn't indicate what temperature is normal nor what is a concern, etc. Therefore, for an uninformed person like me, knowing the transmission fluid temperature is just useless information. Are there any websites or online articles where I might learn enough that the temperature reading might be of some use to me?

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#4495596 - 08/22/17 08:55 PM Re: Transmission Fluid Temperature [Re: Spudislander]
Colt45ws Offline


Registered: 08/15/06
Posts: 9642
Loc: Central Washington
160-200 is great. 200-220 is good. Above 250 is danger zone.
_________________________
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2002 Ford Crown Vic PI 207k, Ex-Kootenai County, ID Unit #42
Down for engine swap
2003 Ford Crown Vic PI 75k
Castrol EDGE HM 5W30, Fram XG2

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#4495612 - 08/22/17 09:15 PM Re: Transmission Fluid Temperature [Re: Colt45ws]
CKN Online   content


Registered: 10/14/14
Posts: 3700
Loc: Utah
Originally Posted By: Colt45ws
160-200 is great. 200-220 is good. Above 250 is danger zone.



With the Siverados and the Dex 6 a warning comes on the driver's information display at 265. GM states that the fluid is has a maximum temperature of 270-and the fluid has been tested up to 285 degrees-however it's the seals in the transmission that will start to degrade at that temperature-so they recommend a maximum temperature of 270 but states the fluid can actually take a lot more heat.

Most Silverado owners find about 80-100 degrees above ambient temperature is where they run.


Edited by CKN (08/22/17 09:16 PM)

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#4495626 - 08/22/17 09:30 PM Re: Transmission Fluid Temperature [Re: Spudislander]
Chris142 Offline


Registered: 06/05/03
Posts: 16820
Loc: Deplorable in apple valley, ca
_________________________
02 Wrangler durablend 10w40
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Z400 castrol T 10w40
Can am maveric edge 5w40
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#4495656 - 08/22/17 10:09 PM Re: Transmission Fluid Temperature [Re: Spudislander]
CKN Online   content


Registered: 10/14/14
Posts: 3700
Loc: Utah
That chart is a little conservative......

The issue being is these charts were around BEFORE the new fluids.


Edited by CKN (08/22/17 10:14 PM)

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#4495741 - 08/23/17 12:20 AM Re: Transmission Fluid Temperature [Re: CKN]
Oro_O Offline


Registered: 09/20/14
Posts: 1351
Loc: Seattle-ish, WA
Originally Posted By: CKN
That chart is a little conservative......

The issue being is these charts were around BEFORE the new fluids.


Totally agree, that chart is apparently based on old whale-oil ATF... wink (FYI, not kidding).

Your excellent post above about the seals being the modern limit is what is worth focusing on regading temparture ranges and limits.

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#4495781 - 08/23/17 03:50 AM Re: Transmission Fluid Temperature [Re: Spudislander]
Lubener Offline


Registered: 01/22/11
Posts: 2576
Loc: N.Ohio
This is useful.

http://www.lubegard.com/pdfs/HeatChart%28AL-516%29.pdf



Edited by Lubener (08/23/17 03:51 AM)
_________________________
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#4495962 - 08/23/17 09:10 AM Re: Transmission Fluid Temperature [Re: Spudislander]
MolaKule Offline


Registered: 06/05/02
Posts: 19042
Loc: Iowegia - USA
Contrary to what ILI says, the only real way to lower transmission fluid temperatures is to use an external ATF cooler.

If you don't tow or race, I doubt you will have any over-temp problems with the ATF.

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#4496073 - 08/23/17 12:12 PM Re: Transmission Fluid Temperature [Re: Lubener]
CKN Online   content


Registered: 10/14/14
Posts: 3700
Loc: Utah
Originally Posted By: Lubener
This is useful.

http://www.lubegard.com/pdfs/HeatChart%28AL-516%29.pdf



According to that chart my transmission should have blown up on my cross country trip towing my 5,500 pound travel trailer with my Silverado. ANOTHER purposely misleading chart to sell product-or it's just out dated altogether.

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#4496112 - 08/23/17 01:09 PM Re: Transmission Fluid Temperature [Re: CKN]
Lubener Offline


Registered: 01/22/11
Posts: 2576
Loc: N.Ohio
Originally Posted By: CKN
Originally Posted By: Lubener
This is useful.

http://www.lubegard.com/pdfs/HeatChart%28AL-516%29.pdf



According to that chart my transmission should have blown up on my cross country trip towing my 5,500 pound travel trailer with my Silverado. ANOTHER purposely misleading chart to sell product-or it's just out dated altogether.

You are probably doing 20k mile fluid changes too. All you offer is your outdated opinion for what it's worth.


Edited by Lubener (08/23/17 01:17 PM)
_________________________
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#4496255 - 08/23/17 04:39 PM Re: Transmission Fluid Temperature [Re: Lubener]
CKN Online   content


Registered: 10/14/14
Posts: 3700
Loc: Utah
Originally Posted By: Lubener
Originally Posted By: CKN
Originally Posted By: Lubener
This is useful.

http://www.lubegard.com/pdfs/HeatChart%28AL-516%29.pdf



According to that chart my transmission should have blown up on my cross country trip towing my 5,500 pound travel trailer with my Silverado. ANOTHER purposely misleading chart to sell product-or it's just out dated altogether.

You are probably doing 20k mile fluid changes too. All you offer is your outdated opinion for what it's worth.


Nope........personal experience and 50,000 mile intervals. And we can disagree on the value of my opinion. As I am disagreeing with yours.

If you don't like my posts they have a"block feature" on BITOG!


Edited by CKN (08/23/17 04:42 PM)

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#4496278 - 08/23/17 05:07 PM Re: Transmission Fluid Temperature [Re: Spudislander]
NYEngineer Offline


Registered: 12/12/06
Posts: 1571
Loc: NY, NY
I have a 2009 Suburban. It has the six speed automatic.
Since I had nothing but trouble with the 4L60E in my older Yukon, I had the trans in the Suburban serviced by the shop I've been using for years immediately upon purchasing. The truck had 9,000 miles on it when I got it.
I did it again at around 55,000 and again at 115. At 115,000, the trans fluid was a little burnt. A few weeks ago, truck had around 139,000 miles, I checked the fluid before a long trip and it was burnt again. I went to the shop, the owner looked at it and suggested a flush and a service. I suggested adding an external cooler. I had the truck for a week prior to the trip and I monitored the trans temp and the condition of the fluid. It was fine. Temps were awesome. 147 on the highway doing 70 on a 74 degree day.
Drove down to Florida. Saw trans temps as high as 190 in bumper to bumper traffic in 99 degree weather. As soon as traffic started moving it would creep down to 178-184.
Strangest thing was on the way home, as soon as we crossed from Florida into Georgia, the air temp dropped ten degrees and the trans temp down along with it to around 168.
Fluid has been in good shape. I'm pretty happy. I just bought a house and really don't want to drop 3500 bucks on a rebuild at the moment.
When Pat (the trans shop owner) serviced the trans, he said the inside looked better than the fluid would have hinted. That's why I went ahead and took it on the trip.
I only wish I had ever monitored the temp before the cooler install.

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#4496597 - 08/24/17 02:16 AM Re: Transmission Fluid Temperature [Re: CKN]
MolaKule Offline


Registered: 06/05/02
Posts: 19042
Loc: Iowegia - USA
Originally Posted By: CKN
Originally Posted By: Lubener
This is useful.

http://www.lubegard.com/pdfs/HeatChart%28AL-516%29.pdf



According to that chart my transmission should have blown up on my cross country trip towing my 5,500 pound travel trailer with my Silverado. ANOTHER purposely misleading chart to sell product-or it's just out dated altogether.


I think it is simply outdated and like many other charts, it is based on the older mineral oil Dex/Merc and older PI formulas.

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#4496659 - 08/24/17 06:35 AM Re: Transmission Fluid Temperature [Re: Spudislander]
Claud Offline


Registered: 02/11/14
Posts: 593
Loc: Margate England
just about every AT equipped car I've owned shifts smoothly from cold. I know too hot will lead to a transmissions repid demise, but can you overcool a transmission to the extent it also hurts it?.

Claud.

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#4496661 - 08/24/17 06:35 AM Re: Transmission Fluid Temperature [Re: Spudislander]
Claud Offline


Registered: 02/11/14
Posts: 593
Loc: Margate England
just about every AT equipped car I've owned shifts smoothly from cold. I know too hot will lead to a transmissions repid demise, but can you overcool a transmission to the extent it also hurts it?.

Claud.

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