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Transmission Fluid Temperature #4495590
08/22/17 07:46 PM
08/22/17 07:46 PM
Joined: Oct 2006
Posts: 58
Canada
Spudislander Offline OP
Spudislander  Offline OP
Joined: Oct 2006
Posts: 58
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?

Re: Transmission Fluid Temperature [Re: Spudislander] #4495596
08/22/17 07:55 PM
08/22/17 07:55 PM
Joined: Aug 2006
Posts: 9,883
Central Washington
Colt45ws Offline
Colt45ws  Offline
Joined: Aug 2006
Posts: 9,883
Central Washington
160-200 is great. 200-220 is good. Above 250 is danger zone.


-Colton
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
Re: Transmission Fluid Temperature [Re: Colt45ws] #4495612
08/22/17 08:15 PM
08/22/17 08:15 PM
Joined: Oct 2014
Posts: 4,037
Utah
CKN Offline
CKN  Offline
Joined: Oct 2014
Posts: 4,037
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.

Last edited by CKN; 08/22/17 08:16 PM.
Re: Transmission Fluid Temperature [Re: Spudislander] #4495626
08/22/17 08:30 PM
08/22/17 08:30 PM
Joined: Jun 2003
Posts: 17,814
Deplorable in apple valley, ca
Chris142 Offline
Chris142  Offline
Joined: Jun 2003
Posts: 17,814
Deplorable in apple valley, ca


02 Wrangler carlube 5w30
87 F250 traveler 15w40
07 fjcruiser Chevron 10w30
Z400 castrol T 10w40
Can am maveric edge 5w40
57 case tractor 15w40
Re: Transmission Fluid Temperature [Re: Spudislander] #4495656
08/22/17 09:09 PM
08/22/17 09:09 PM
Joined: Oct 2014
Posts: 4,037
Utah
CKN Offline
CKN  Offline
Joined: Oct 2014
Posts: 4,037
Utah
That chart is a little conservative......

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

Last edited by CKN; 08/22/17 09:14 PM.
Re: Transmission Fluid Temperature [Re: CKN] #4495741
08/22/17 11:20 PM
08/22/17 11:20 PM
Joined: Sep 2014
Posts: 1,485
Seattle-ish, WA
Oro_O Offline
Oro_O  Offline
Joined: Sep 2014
Posts: 1,485
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.

Re: Transmission Fluid Temperature [Re: Spudislander] #4495781
08/23/17 02:50 AM
08/23/17 02:50 AM
Joined: Jan 2011
Posts: 2,826
N.Ohio
Lubener Offline
Lubener  Offline
Joined: Jan 2011
Posts: 2,826
N.Ohio
This is useful.

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


Last edited by Lubener; 08/23/17 02:51 AM.

The "thinking" man's friend.
Re: Transmission Fluid Temperature [Re: Spudislander] #4495962
08/23/17 08:10 AM
08/23/17 08:10 AM
Joined: Jun 2002
Posts: 19,494
Iowegia - USA
MolaKule Offline
MolaKule  Offline
Joined: Jun 2002
Posts: 19,494
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.


"Molon Labe" (Greek, King Leonidas to the Persians regarding their weapons "Come and Take Them!").
Re: Transmission Fluid Temperature [Re: Lubener] #4496073
08/23/17 11:12 AM
08/23/17 11:12 AM
Joined: Oct 2014
Posts: 4,037
Utah
CKN Offline
CKN  Offline
Joined: Oct 2014
Posts: 4,037
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.

Re: Transmission Fluid Temperature [Re: CKN] #4496112
08/23/17 12:09 PM
08/23/17 12:09 PM
Joined: Jan 2011
Posts: 2,826
N.Ohio
Lubener Offline
Lubener  Offline
Joined: Jan 2011
Posts: 2,826
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.

Last edited by Lubener; 08/23/17 12:17 PM.

The "thinking" man's friend.
Re: Transmission Fluid Temperature [Re: Lubener] #4496255
08/23/17 03:39 PM
08/23/17 03:39 PM
Joined: Oct 2014
Posts: 4,037
Utah
CKN Offline
CKN  Offline
Joined: Oct 2014
Posts: 4,037
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!

Last edited by CKN; 08/23/17 03:42 PM.
Re: Transmission Fluid Temperature [Re: Spudislander] #4496278
08/23/17 04:07 PM
08/23/17 04:07 PM
Joined: Dec 2006
Posts: 1,785
NY, NY
NYEngineer Offline
NYEngineer  Offline
Joined: Dec 2006
Posts: 1,785
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.

Re: Transmission Fluid Temperature [Re: CKN] #4496597
08/24/17 01:16 AM
08/24/17 01:16 AM
Joined: Jun 2002
Posts: 19,494
Iowegia - USA
MolaKule Offline
MolaKule  Offline
Joined: Jun 2002
Posts: 19,494
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.


"Molon Labe" (Greek, King Leonidas to the Persians regarding their weapons "Come and Take Them!").
Re: Transmission Fluid Temperature [Re: Spudislander] #4496659
08/24/17 05:35 AM
08/24/17 05:35 AM
Joined: Feb 2014
Posts: 595
Margate England
Claud Offline
Claud  Offline
Joined: Feb 2014
Posts: 595
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.

Re: Transmission Fluid Temperature [Re: Spudislander] #4496661
08/24/17 05:35 AM
08/24/17 05:35 AM
Joined: Feb 2014
Posts: 595
Margate England
Claud Offline
Claud  Offline
Joined: Feb 2014
Posts: 595
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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