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Transmission Tempature

jim cook

By jim cook
in Ask A GM Technician

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jim cook Enthusiast

jim cook

Posted
Posted

I have a 2007 GMC Sierra 1500, the new model, it has a 4.8 liter v8 engine. i like to keep an eye on transmissiom temp. My truck came equpped with the towing package which includes a trans. cooler. as the the engine stays at steady 210 degrees after it is warmed up, what is the normal temp. range for the transmission. The transmission is the 4 speed automatic.

 

Thanks,

 

Jim

gmtech4 Senior Enthusiast

gmtech4

Posted
Posted
I have a 2007 GMC Sierra 1500, the new model, it has a 4.8 liter v8 engine. i like to keep an eye on transmissiom temp. My truck came equpped with the towing package which includes a trans. cooler. as the the engine stays at steady 210 degrees after it is warmed up, what is the normal temp. range for the transmission. The transmission is the 4 speed automatic.

 

Thanks,

 

Jim

hi jim,as a gm tranny guy I have asked the same question and found that there is no real spec,I could not find it in our service info,so your truck does not have a gauge ,you can put one on or a chip moniters trans temp thru the data stream,on 3/4 tons and up the factory gauge ,the temp sits at a quarter on the gauge,gl

C & A s Dad Senior Enthusiast

C & A s Dad

Posted
Posted

James, the aux cooler is an oil to air cooler so the outside air temp will affect the fluid temps to some degree. I have upsized my aux cooler because I tow a large camper and I monitor my trans temps with a Interceptor scan gauge. I live in the deep south so we realy do not have any winter temps that would cause me to overcool my trans. My temps run 130 to 140 in 90+ degree heat and mid 160s when towing in 95 degree heat. Not sure if this helps you or not.

C & A s Dad Senior Enthusiast

C & A s Dad

Posted
Posted

Barry, that is good info and the Lubegard is the product that I have often talked about. They make some excellent products and are widely known in the trans industry. I have run it in all of my trans and power steering units for years. The only exception is I am now using Amsoil syn fluid in my GMC and Amsoil advised against it since they feel their premium syn fluid is a total package.

 

Thanks for posting the info.

KB06YUKONXL Enthusiast

KB06YUKONXL

Posted
Posted

SInce you have a 2007 truck you have DexronVI fluid which should run the trans cooler than DexronIII in the previous years. You really need to do nothing as the temperature range of this new synthetic fluid will handle over 200F easily. If you are concerned then shorten the fluid change interval to 30,000 miles to insure the additive package is robust. FWIW my 06 denali has a 4L60 4 speed and my temp guage never goes past 170F in the Summer heat.

C & A s Dad Senior Enthusiast

C & A s Dad

Posted
Posted

The Dex VI fluid will certainly handle more heat but I am sure 200+ consistently will shorten the life of the clutch packs, friction materials, seals etc.

 

I like to see temps well below 200.

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