6.0/3.73/6speed in mountains pulling 8000 lbs
I have 2013 suburban 2500 pulling my new Creekside 27 bh which is 8,000 loaded. First trip with this combo over Stevens pass hwy 2 in Washington state. Once the serious climbing started I was 2nd gea...
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235 degrees for the ATF is not going to cause any problems. The temp rises because you have less air going through the cooler fins at 45 MPH but due to the grade there is still a lot of heat being generated inside the transmission. At higher elevations there is also less air and this does not help the situation. All you need to do is be sure that the ATF level is not low.
For pulling a load up a grade I would keep the engine at the RPM's where it produces maximum torque and not maximum horsepower.
As you noticed the ATF temperature quickly dropped after you reached the top of the grade and that is all you want to see. At least you know the trans fluid temp should reach 232 degrees in that situation so if in the future you see it going a lot higher you will know something is wrong.
For pulling a load up a grade I would keep the engine at the RPM's where it produces maximum torque and not maximum horsepower.
As you noticed the ATF temperature quickly dropped after you reached the top of the grade and that is all you want to see. At least you know the trans fluid temp should reach 232 degrees in that situation so if in the future you see it going a lot higher you will know something is wrong.
