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Old 06-08-2014, 02:57 PM   #1
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need transmission 101 class

howdy, we went up here this weekend we liked it we had a quite spot, http://www.sevenmaples.com

It took a while for me to back into a spot it was uphill and I had to turn between two trees. There were other empty ones nearby but i had to get into this one...you understand.

After 15min or so of backing up and down the hill, i noticed the tranny temp was 243 why ?(i stopped and let it cool for a while)

I take it i was not in a fixed mechanical gear.
My brain says i was in reverse and somehow locked into a gear so it shouldn't get hot like it when it shifts going up hill.

Are we ever in a physical gear any more or is it all pressure driven by the evil torque converter..........

clueless....pete
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Old 06-08-2014, 04:28 PM   #2
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You are right about the torque converter being the cause of the problem. They only lock up when in the upper forward gears, cruising on the highway.
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Old 06-08-2014, 05:32 PM   #3
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Your Transmission cooler needs a steady flow of air to pass through it in order for the heat exchange to work. When you are not moving far or fast heat tends to build up. Plus all the residual heat from the engine and oil cooler transferring when you are stopped after working the engine. Even shutting the engine off will not immediately help, as all the hot fluids still sit in the cooler and pan, with the pump off.
My temp is lower when going up and down hills at a good speed. In the city or stop and go traffic with no speed or air flow the T Temp climbs.
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Old 06-08-2014, 06:44 PM   #4
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A torque converter is a fluid coupling. It slips untill the disigned rpm is reached. This rpm depends on the motor power band. If you are backing up at low rpms then the converter is slipping causing heat. So sitting still or moving very slow (reversing) can cause temperature rise.
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Old 06-08-2014, 10:33 PM   #5
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Received a helpful hint from an experienced 42 year transmission/auto mechanic veteran that encourages all his camping customers this simple tip.....

"When backing into a campsite, stop and take the time to engage the 4 X 4 when available on the tow vehicle. 85% of the transmission problems that he encounters is because of the abuse due to the strain and high temps produced through slow/low speed."

Use it for what it's worth. I know I have adopted this practice.
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Old 06-09-2014, 04:55 AM   #6
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I can only see the 4 wheel drive helping if you shift into low. This will lower the gear ratio allowing the motor to rev higher and the converter will not build as much heat then.
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Old 06-09-2014, 07:49 AM   #7
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Quote:
Originally Posted by jakesz28 View Post
I can only see the 4 wheel drive helping if you shift into low. This will lower the gear ratio allowing the motor to rev higher and the converter will not build as much heat then.
I am no mechanic, but I was wondering how/if that would make a difference?
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Old 06-09-2014, 08:57 AM   #8
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If the transfer case is shifted into low range the extra gear reduction would be between 2.69 to 1 up to 4 to 1 depending on model of vehicle.

But if the have a 4.10 rear end then a 2.69 low range the combined gear reduction is 11.02, not including reverse or 1st gear in the tranny. So the motor can rev higher and is at a higher mechanical advantage so the torque convertor will build less heat backing up a hill or positioning the trailer on blocks.
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Old 06-12-2014, 04:17 PM   #9
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One of the first things I did when we bought our 07 Silverado was replace the factory trans cooler with a B&M HI-Tek (70297) cooler. This model has a thermal switched electric fan that automatically comes on at 176 deg. F. Most of the time when backing/positioning our trailer the fan will kick in after a couple of minutes.

On our 07 Silverado the two factory electric cooling fans will come on when you turn the AC on. This may or may not work for your 2008 Yukon but if it does it is a way to get some air movement through your cooler.
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Old 06-12-2014, 04:37 PM   #10
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Another small addendum: When you have your trans flushed next time, upgrade to synthetic trans fluid.
Every little bit helps.
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