Forum Discussion
Campfire_Time
Dec 29, 2017Explorer
badsix wrote:
last summer with temps near 100deg. I had to go up a 5 mile steep mountain pass with my 2010 GMC 1500 with tow package and a 27' T/T. the towing part was not a problem, I was able to travel 60mph easy. but as I started up the trans temp started up soon we are a little over 200. now the engine is starting to heat up, it was kinda like a nuclear reaction. by the time we hit the top the trans was about 240.
That behavior is perfectly normal. It's a short burst. So long as you are not running long periods at 240 you'll be fine. Are you running Dex VI fluid? If not switch to it. They started using it in 2006 and it's backward compatible for all 4L60E/4L80E transmissions. It's a synthetic blend and runs cooler than the older Dex III.
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