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Old 07-01-2014, 12:34 AM   #1
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Transmission fluid temperature

It was 102 in Albuquerque today and I noticed that my transmission fluid temperature was 193. I started doing research on it then came across an old thread here that you can no longer join. One of the posts stated that 270 degrees was the max you wanted to let it rise to - that seems awfully high. I have the new 2014 5.3L V8 Chevy Silverado and I'm so thankful I have the transmission fluid temperature gauge built in so I can monitor it. I'm not looking forward to pulling Raton pass in this heat but there's no other choice. Hope the transmission fluid temperature doesn't get too bad so I'm pulling over and stopping a lot. This heat this summer is just RIDICULOUS!!
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Old 07-01-2014, 12:47 AM   #2
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193 is fine. Concern starts, for me at least, around 225 and I don't want to see above 250.

At that point pull over, toss it in park and let it idle. The fluid keeps moving, the fan keeps spinning and it will cool things off far quicker than just turning it off.

Does yours have the auxiliary cooler? If not they're cheap insurance and can really do a job.
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Old 07-01-2014, 04:57 AM   #3
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X2 on an auxiliary cooler hooked in series with the stock one, or replacing the stock one with a MUCH larger one.
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Old 07-01-2014, 08:49 AM   #4
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193 is normal and tells you the truck is operating perfectly. As stated above you may want to pull over in the 225 plus range but be sure to keep the motor running. At 193 on a 102 degree day I highly doubt you will have a problem with your truck.


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Old 07-01-2014, 08:52 AM   #5
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Don't know what temp the newer Chevy's typically run; but my F150 runs 195 normally. Can't believe that 193 is a problem.
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Old 07-02-2014, 08:17 PM   #6
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193 degrees is fine. I believe at around 230 deg it starts to break down. I seen 200 deg on a step grade last week in 90 deg wx, and I was going to pull over, but it went back down. If it does get up there, like it has already been said on here, pull over and put it in neutral until it cools down.
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Old 07-05-2014, 07:50 PM   #7
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I too have read MANY different threads on this thought and as a result tend to "monitor" my trans temps perhaps verging on the anal side down here in sunny MUGGY Florida. Mid 190's is my normal towing trans temps through the Central Florida "ridge" hills in the middle of a 90-95 degree day. When I pull off the interstate and don't have all that moving air, temps will climb to about 210 +/- until I get to a lower speed and things catch up. So I hope my experience adds to all the other comments here that it seems your temps are more or less in spec and no need to worry.
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Old 07-05-2014, 08:08 PM   #8
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There's a former Ford Transmission Engineer on some of the Ford Forums. His take is that modern transmissions and fluids are fine up to 220F all day long and up to 250F for short times (up to 1/2 hr).

Modern transmissions are thermostatically controlled and are set to run at a specific operating range. This is done for fuel mileage (warmer fluid is thinner and easier to pump around... Less drag).

Now on my old school transmission, it's not thermostatically controlled, and I have a large cooler (one from a 6.0L truck). It runs 50-60F over ambient temps unloaded and pulling my TT, It gets to 70-80 over ambient pulling my TT in the hills. I haven't pulled a steep grade with it yet. I'm more concerned that I'm not getting it hot enough in the winter now and possibly causing damage being too cool.
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Old 07-05-2014, 08:17 PM   #9
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You have to remember that in most trucks the fluid runs through the aux cooler first and then the radiator cooler. The radiator will actually heat the trans fluid if it is too cold. This is designed that way to reduce the stress on the tranny on very cold days. Too cold fluid is just as bad as too warm. Considering that the radiator runs at 195 to 205 degrees normally, the 193 degree temp is about as low as it will go on a warm day.
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Old 07-05-2014, 08:46 PM   #10
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Quote:
Originally Posted by joshuajim View Post
You have to remember that in most trucks the fluid runs through the aux cooler first and then the radiator cooler. The radiator will actually heat the trans fluid if it is too cold. This is designed that way to reduce the stress on the tranny on very cold days. Too cold fluid is just as bad as too warm. Considering that the radiator runs at 195 to 205 degrees normally, the 193 degree temp is about as low as it will go on a warm day.
That transmission engineer I mentioned will argue this. His teams findings were that the cooler run through the radiator is at a spot in the radiator where the coolant is significantly cooler than the engine temps.... It's at the bottom where the coolant has been as cool as it gets. As a result, there no heating of the transmission fluid from the radiator, ever.
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