Gmc - Yukonxl :: 2006 - Transmission Started Slipping / Warning Light Came On
Oct 22, 2011
I have a 2006 GMC Yukon XL and its transmission started slipping at just under 60K miles. My local repair shop (who I trust) suggested a transmission shop that they work with a lot. Since I tow a trailer with the vehicle it seems reasonable enough to go with their suggestion to rebuild the transmission using upgraded “heavy duty” components and install a transmission cooler, which I had them do. If you are interested in seeing what they installed, I have uploaded the repair tag at [URL] ....
Right after we got the car back we took the trailer on a trip and very soon the “Transmission Hot” warning light came on. I happened to be driving very close to the transmission shop at that time so I stopped by and they replaced the transmission fluid with synthetic fluid and said that would remedy the situation. However, very shortly after leaving the shop the warning light came on again. At the time I asked the owner of the shop if the heavy duty transmission might just run hotter than the original and he told me that it should not. Well, I brought it back in and he disassembled and reassembled the transmission and even moved the placement of the transmission cooler but, long story short, the transmission hot light still comes on.
Then he changed his tune told me that the heavy duty transmission should run hotter, contrary to what he told me originally. He went on to tell me that there was no way to adjust the temperature sensor that controls the warming light so he convinced me to install a supplemental temperature gauge for the transmission. He said that the sensor was set at the factory to trigger at 180 degrees and that the transmission was likely just running a few degrees over that. So, we made a deal that he would install the gauge and if the transmission temperature stayed below 190, which he said was a safe number, then I would pay for the gauge, but if the transmission ran over 190 degrees, he would cover the cost because that would indicate that there was probably something wrong with the transmission.
He did the work but now he has once again changed his tune and is telling me that it is no problem for the transmission temperature to run as high as 250, which is 60 degrees higher than what he told me originally. So, the question is,
1) should a heavy duty transmission with a cooler run at a higher temperature than standard transmission and
2) how hot is too hot for it to run?
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Over the weekend, I drained and filled the transmission fluid with new T-IV (not a complete flush) to see. Drove it around the block a few times and no slipping, but I can hear a faint hum/whine, similar to when in reverse gear but softer. I can't say for sure if anything improved, I would have to drive it til warm to reproduce last week's conditions. I was too nervous that it'll die completely again and I'd have to push it home. The hum was enough for me to say, yes something is still wrong.
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