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Open Roads Forum  >  Towing

 > trans. temp

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bgant4

Naples, Fl

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Posted: 02/23/12 03:12pm Link  |  Print  |  Notify Moderator

I have an 2008 GMC duramax 2500 4wd. When I am towing my rv what is the max the trans should reach? It normaly runs about 170. Where is the danger zone?

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Posted: 02/23/12 04:20pm Link  |  Print  |  Notify Moderator

Depends on who you ask. I like to stay below 200*, but anything above 225* will surely start to cause premature breakdown of your fluid.


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tvman44

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Posted: 02/23/12 04:39pm Link  |  Print  |  Notify Moderator

I like to see under 200 or if over just for a very short time.


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boogie_4wheel

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Posted: 02/23/12 04:45pm Link  |  Print  |  Notify Moderator

200 would get me to actually start watching it.
210 would have me start changing driving to help cool.
220 I would stop and idle to cool

I have my CTS set to alarm me at 220.


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skipnchar

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Posted: 02/23/12 04:57pm Link  |  Print  |  Notify Moderator

There really IS no danger zone as such. Your temp will likely very based on the ambient temperature and the difficulty of the job it's being asked to do. ON a hot day towing a heavy load up a steep hill it will run a lot hotter than a winter time cruise down a level road. The DANGER comes from running at extreme temperatures for an extended period of time but a five or ten minute jump while climbing a mountain pass will usually not harm anything when temps hit 220 or 230 degrees. If you ran that warm WITHOUT working it hard or for longer time periods it would be time to do a fluid flush in the long term or pulling over and letting it idle in park for a while to cool down.


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12th Man Fan

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Posted: 02/23/12 05:05pm Link  |  Print  |  Notify Moderator

I have an 09 Dually GMC CC and when pulling in the summer I frequently run in the 200-210 range.I have seen it as high as 219 but only briefly. I have talked to the dealer and they would not give me an exact temp but they said those temps wer not a problem. The truck will let you know before you do any damage. Just change your fluids on the recommended mileage.

I often wonder how the transmission fluid can run cooler than the water when the fluid is circulated through the raditor. My water temp is steady at 210. It fluctuates some but when the jet propelled fan come on it cools back down pretty quick.


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boogie_4wheel

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Posted: 02/23/12 05:51pm Link  |  Print  |  Notify Moderator

12th Man Fan wrote:


I often wonder how the transmission fluid can run cooler than the water when the fluid is circulated through the raditor. My water temp is steady at 210. It fluctuates some but when the jet propelled fan come on it cools back down pretty quick.


Your radiator temp is not 210, just your engine temp. The radiator temperature is almost always cooler than the engine temp. The radiator/trans water-to-water cooler actually does a pretty good job of displacing trans heat.

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Posted: 02/23/12 06:09pm Link  |  Print  |  Notify Moderator

Pulling a heavy trailer you shouldn't use 6th gear at all. 6th will allow the torque converter to unlock on an Allison, which causes excessive heat. Even if it holds 6th ok you shouldn't use it.

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crickeydog

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Posted: 02/23/12 06:49pm Link  |  Print  |  Notify Moderator

Your tranny temp sounds a bit high to me on average. Our tranny temp seldom ever gets above 150 degrees in 6th gear at 60 MPH even on a hot day towing our 14K 5'er. Stop & go traffic will push the temp close to 200. I've read any temp over 200 degrees for any length of time on the Allison can be hard on your fluid & tranny.

Happy camping!!! See y'all down the road!!!


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04FX4

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Posted: 02/23/12 07:16pm Link  |  Print  |  Notify Moderator

Your temps are fine. 220 is not abnormal to see while climbing up steep hills. Do a search on the internet. Just make sure you do your maintenance .

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