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Old 04-07-2009, 02:15 PM   #21
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Those seem to be normal temps, even at 180F you're not hurting your unit unless you drove it for thousands of miles that way.
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Old 10-24-2009, 09:17 AM   #22
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I just returned from Elkhart IN with a Rockwood 2604SS. TV is a 2008 Silverado 1500 4X4 LTZ 5.3 3.73 rear and towing package. On the trip to Elkhart trans temp was around 150-160 in drive 19 mpg. On the trip back towing the 2604SS at 60mph in drive cruise control on trans temp 180-190 and shifting on every hill, sometimes down to second gear at 4000 rpms, 8.5 mpg. After about 100 miles I shifted to third 2600 rpms, cruise control off at 60 mph trans temp 155-164 rarley shifted and 9 mpg.
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Old 10-24-2009, 09:41 AM   #23
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Quote:
Originally Posted by Hipshot View Post
I just returned from Elkhart IN with a Rockwood 2604SS. TV is a 2008 Silverado 1500 4X4 LTZ 5.3 3.73 rear and towing package. On the trip to Elkhart trans temp was around 150-160 in drive 19 mpg. On the trip back towing the 2604SS at 60mph in drive cruise control on trans temp 180-190 and shifting on every hill, sometimes down to second gear at 4000 rpms, 8.5 mpg. After about 100 miles I shifted to third 2600 rpms, cruise control off at 60 mph trans temp 155-164 rarley shifted and 9 mpg.
I very seldom use cruise control while pulling my trailer. I get much better gas mileage by loosing a mile or 2 on the speedo going uphill then the cruise control keeping the speed. If using the cruise control, then I feel compelled to lock out OD to keep the shifting under control.....which means more RPMs and worse gas mileage. In the rolling hills around here, I will leave the OD on, back off on the gas pedal a little on hills, and shift out of OD when I figure the tranny is ready to shift for itself. I do watch my tranny temperature via a ScanGauge II.....remarkable little instrument.

About the chart on post #1. I never noticed before, but that is the "average" temperature. My truck averages 150 to 170 pulling my Surveyor, but has gotten up to 200 on a long, hard pull up a winding moutain pass here. So my average should be pretty close to 160 or so, with the occasional spike under hard pulling conditions. A little relief to know that.
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Old 02-08-2010, 09:36 PM   #24
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gauge clusters

I do like the gauge mounting package for the top of the dash!! This looks so much better than a pillar mount. Even if you don't purchase the Aerotech gauges, I am sure that their dash mount kits would work with the correct diameter gauges of another manufacturer.

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Old 04-26-2010, 04:02 PM   #25
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My toyota tundra has the c& h but it never wiggles pulling the camper nor does the eng temp gauge either even on the hottest days pulling through the adirondak Mtns it seems to do just fine
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Old 04-27-2010, 08:48 AM   #26
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I talked to my GMC about this very issue. I have the Allison transmission and I occasionaly pull my rig into the "hills" of PA.
My D.I.C. trans temps can get into the 200 - 220 range but rapidly fall back to 180 - 195 on the back side of the climb.
Normal temps on the highway 160 - 170.
I never got the warning on the DIC. So I asked when it was set to come on and they "thought" it was 250. They said if it even came on I needed to pull over and let the tranny cool down and bring it in for service (filter-fluid change) when I got back from the trip (no real need to rush; just get it done soon as I get back).
They said the Allison was built like a tank and would provide may years of hard service with regular maintenance.

Neat that the Allison has an external spin on filter.
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Old 07-11-2012, 06:27 PM   #27
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Like rockwood06, my 2012 GMC Sierra has a DIC which displays transmission tempertaure. I wasn't sure what is was supposed to be, so this chart is helpful. Towing in the mountains last week when the ambient temperature was 103, my transmission temperature was holding at 179. The truck has the factory heavy duty towing package, which includes an auxillary tranmission cooler. So far I'm happy with it. Towed my Rockwood 2304 2175 miles in the past 2 weeks.
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Old 07-12-2012, 10:09 PM   #28
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my 2008 chev. 3500 4x4 diesal with allison transmission while towing a 35 ft. cardinal 5th wheel on hot day peaked at 194 degrees according to dic. i dont know if this is a problem or not. any info helps. thanks.
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Old 07-12-2012, 11:43 PM   #29
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I know this is an old thread, but as it has resurfaced I'll point out that the chart at the beginning of the thread has been around for decades. It was probably accurate when produced, but modern synthetic ATF is much improved in resistance to degradation from heat. Transmission shops love the chart as they make quite a bit of money flashing it around.

ATF+4 has been used by Chrysler for some time now. It is considered a "fill for life" fluid with an expected life in excess of 100,000 miles. A few highlights of SAE paper #982674:

The Durability (aging) phase involves maintaining the fluid/friction material system under continuous slip at a constant load of 4.0 kN for 6 hours at 100 rpm. Test temperature is maintained at 171C (171C is 339F)

Two results on ATF B at 150C are shown in Table 9. These results show the superior anti-scuffing performance of ATF B over ATF A. This improved performance has been confirmed in vehicle fleet tests conducted by Chrysler and shown in Figure 8. (150C is 302F)

The transmissions operated on ATF A had fluid changes at 15,000-30,000 miles. 15,000 mile oil change intervals slowed but did not eliminate the chain wear. The transmissions operated on ATF B did not show high chain stretch levels even after nearly 100,000 miles of taxi operation without a fluid change. The field data demonstrates the superior wear performance of ATF B and directionally agrees with the bench test data shown in tables 8 and 9.

Most of the development was at 88C (190) or above.

There are other transmission components which you do not want to get that hot, but ATF+4 is pretty robost.

For your viewing pleasure:

http://u225.torque.net/cars/tech/trans/982674.pdf
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Old 07-12-2012, 11:53 PM   #30
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Towing a 6400# (dry) 5th wheel with a '06 Chev 2500, generally runs about 95-100 degrees F above ambient.
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