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Old 09-16-2015, 10:43 AM   #71
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If you follow the transmission lines on the Ford from the radiator back to the transmission you will find a thermostat in the transmission lines. It is roughly the size of a pack of cigarettes, this thermostat is made to bypass the fluid back to the transmission till the temperature of the fluid hits roughly 180-190 degrees. It then opens and allows the fluid to flow to the radiator and auxiliary cooler. temps of up to 210-220 on a long hill can be had.
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Old 10-13-2015, 09:50 PM   #72
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I pull my SolAire 20RBS with a Tahoe with the Heavy-Duty Towing Package and a 3.42 rear end. It has the seperate tranny cooler and an engine oil cooler. Not towing, I'm getting about 160-170 on the tranny. Towing across Texas, the tranny temp was 180. Pulling a steep grade it went to 195. The engine temp started climbing until I killed the A/C and kicked the blower fan in the passenger compartment up to high. The temp dropped. I have the tranny fluid checked regularly and when it starts to get darker red instead of light red, it gets changed.
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Old 10-18-2015, 11:42 PM   #73
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Transmission Temperature Chart

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65-70mph, No hills. 2010 Silverado 5.3l 6 speed.
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Old 10-19-2015, 12:11 AM   #74
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Quote:
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Attachment 92089

65-70mph, No hills. 2010 Silverado 5.3l 6 speed.
You probably have the 3.73 ratio axle. Those should pull a little cooler than the 3.43 axle.
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Old 10-19-2015, 08:44 AM   #75
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Transmission Temperature Chart

No, 3.08. That's the Joy of the 6 speed. It's like having a 4 speed with a 373. My wife has an 07 Tahoe with a 5.3, 4 speed 373 gear non hd towing. It pulls about the same as my truck but the short wheelbase and the lack of an aux trans cooler are the limiting factors.
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Old 10-19-2015, 12:15 PM   #76
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Interesting. I have the HD trailer package in my Tahoe and a 6-speed, with the 3.43 rear axle. In Tow-Haul mode, you only have a 4-speed tranny. What were you towing?

Also, I see the outside temperature was 57 degrees so you will run a bit cooler.
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Old 10-19-2015, 12:25 PM   #77
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07-08's got the 4 speeds. 09 up got the six. I've never tried to tow the camper with the Tahoe, because of the tall hitch height vs my Silverado. But I do tow the boat with it. Click image for larger version

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Old 10-19-2015, 02:02 PM   #78
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Dashboard pic is my Silverado. Was towing our Cherokee 274dbh.
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Old 10-22-2015, 01:47 PM   #79
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Quote:
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No, 3.08. That's the Joy of the 6 speed. It's like having a 4 speed with a 373. My wife has an 07 Tahoe with a 5.3, 4 speed 373 gear non hd towing. It pulls about the same as my truck but the short wheelbase and the lack of an aux trans cooler are the limiting factors.
It's easy to get taken by surprise with the new Transmissions and less aggressive rear ends.

In some of the old 4 speed Auto Trannies, you might get a 1st gear with a 2.48 ratio, a 2nd gear with a 1.48 and a 1 to 1 3rd gear with a weenie overdrive.

THEN, the rear end REALLY made a difference. Big time.

Nowadays with the new high tech 6 speeds, you can get a 1st gear ratio of 4.17, a 2nd gear ratio of 2.34 (nearly as high as the old GM 1st gear!!) with TWO Overdrives. So with a 3:31 rear end, I'm not gonna worry a bit.

I might not see 6th gear very much, if at all, but I don't care. I don't want the Torque Converter to lock up anyway.
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Old 10-23-2015, 09:53 PM   #80
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Why would you not want the converter to lock up? That is a good way to overheat your transmission.
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