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MPC

09 GMC AWD Denali 6.2

6 posts in this topic

Hi All, I have been reading through the forum on several topics,and one that really caught my attention was the tranny issues. My 09 GMC has either a 80 or a 90 trans., I do not have my paperwork with me, and I do not remember.

Here are my questions. My tranny has a temp moitor and what shold it run and what is the max temp before issues start? I do not know where the reading is taken from,and I assume that would be important too. It has a factory installed cooler and it is in fromt of the radiator on one side and the engine oil cooler is on the other side, I believe. All that came with the trailering package.

2nd question is this,since the trans. comes with Dextron VI synthetic fluid I assume that will help matters of longjevity,is that true? At some point, early, less than 10,000 miles, should I drop the tranny pan and change the filter and send fluid off for analysis? Is any one filter better than the stock GM filter?

This is my bottom line, I plan to keep the truck for a long time and really do not want tranny issues, if I can help it. What can I do to prevent them and what are the problems to look for?

Thanks, MPC

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Well congrats on the nice rig first of all. Denail's are sweet and my favorites in the GMC line-up, as for the technical details, I bet a gear head around here not me could help you. I wonder if this wouldn't get more attention in the tech section. Let some of the gearheads around here chime in first.

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Hi MPC! I moved your topic to the tech section of the boards. I don't know the answer to your question but hopefully someone here will...

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Well I had tranny problems with my Grand Prix, and I had it rebuilt to handle more power. But the transmission shop I went to recommended changing the fluid once a year.

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Thanks for the move and I have not asked the dealer yet either. I wanted an Idea of what the real world thinks before I move on to GM on the issue. One would think the Owners manual would have that temp indicated somewhere,and maybe I just overlooked it. Thanks again for the move. MC

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Thanks for the reply, It has not gone over 161F so far. It has been up to 97 degrees in our part of the world. I still assume that the temp is taken at the right area through GM Research. When I ask the dealership it will be interesting to see what they say. MC

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