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Trans temp.

Trans temp.

Postby Big Silverado [OP] » Jul 06 2011, 8:13pm

Hi everyone.

Does anyone know what is the normal operation transmission Temp? I'm getting between 174F to 185F only highway driving with out any load on the truck. The truck only have 21,500 miles on her.

Thanks
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Re: Trans temp.

Postby Z15 » Jul 06 2011, 8:58pm

The owners manual states the the fluid should be at normal operating temperature, which is 82°C to 93°C (180°F to 200°F) when checking the ATF level.

I traveled about 500 miles last Friday and hauled back about 500 lbs of oil. Temps were in the high 80's to low 90's. I keep a eye on the my trans temp gauge just to see what it would run at in the heat and it stayed in the 170's. Normal driving. I changed mine over the synthetic at very low miles and now have about 13,000+.
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Re: Trans temp.

Postby adams99z71 » Jul 07 2011, 1:04am

went to disneyland a few weeks ago. 80degrees outside up and down hills my trans stayed around 175
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Re: Trans temp.

Postby EKinMN » Jul 07 2011, 3:39am

Weird. Mine stays in the 140 - 155 range in normal driving. Up to 160-165 when I am towing the boat. Ambient temps in MN have been around 75 - 85 degrees. Seems like mine is running cooler than most?
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Re: Trans temp.

Postby starspangled6.0starspangled6.0 is online! » Jul 07 2011, 3:42am

And mine stays in the middle range (I forget- is that right around 200?). It's almost always a tick below the middle mark, but it has poked past it (like when I was trying to get unstuck in the winter :().

However, we've got different axles\transmissions\engines, so is it really apples-apples?
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Re: Trans temp.

Postby davidbarrett » Jul 07 2011, 11:28am

I have been on the road since June 6th towing 7000 lbs trailer on hauls around 400 km a day and mine is usually around 65 to 75 and goes up to about 79 to 80 when I am pulling a lot of big hills, I am glad Big Silverado started this topic so I feel better about my temperature.
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Re: Trans temp.

Postby Z15 » Jul 07 2011, 12:19pm

My rear axle is a 3.42 and I made a mistake typing, mine stayed in the 150 range, not 170 as I listed and I was on cruise control most all the time I could.

Towing or hauling
Somewhere I was reading that if you are towing you should use tow haul mode for several reasons. It over-rides the alternator fuel economy mode and allows more power to charge the battery when a trailer is connected. If you do not you could have battery run down problems. It also allows the cooling fans to run longer to cool the engine and transmission heat. Everyone just thinks its for trans shifting but that's not the only feature of tow/haul mode.


Vehicles with an automatic transmission have a Tow/Haul Mode. The Tow/Haul Mode adjusts
the transmission shift pattern to reduce shift cycling, providing increased performance, vehicle control, and transmission cooling when towing or hauling heavy loads.


If charging a remote (non-vehicle) battery, press the Tow/Haul Mode button, if equipped, located at the end of the shift lever. This will boost the vehicle system voltage and properly charge the battery. If the trailer is too light for Tow/Haul Mode, or the vehicle is not equipped with Tow/Haul, turn on the headlamps as a second way to boost the vehicle system and charge the battery.
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Re: Trans temp.

Postby davidbarrett » Jul 07 2011, 1:42pm

I totally agree with above, I use tow haul mode most of the time, but I do use normal haul when on a prolonged flat, although not to many of them here in Newfoundland lol
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Re: Trans temp.

Postby EKinMN » Jul 08 2011, 12:33am

Interesting, Mike. I plan on doing some long distance towing this summer. Given that fully loaded with the boat, I will only be at about 5,000 lbs, I thought i would go with out tow/haul. Now I think I may consider using it.

However, my boat has surge brakes, not electric, and my headlights are always on, due to the HID relay. So there again, I may not need it?
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Re: Trans temp.

Postby starspangled6.0starspangled6.0 is online! » Jul 09 2011, 2:13am

Towing the trailer today (90F outside temp), the tranny temp stayed at about 190 the whole time, except when I was on the freeway. It would drop to about 160 or 150... is this because of the increased air going through the radiator?
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