Overheating issues

[mike5]

I've seen the same tranny temp issues happen on 2011 and 2012 Jeeps. They had it either in 4H or 4L and set to Drive. As soon as they switched to 4L and used 1st and 2nd as necessary...all was well.

Let me know if you head out for some wheelin' again. I love the Sierras and might be able to make it.

[kuroi]

Go with electric fans and ditch the mechanical one as mechanical fans don't move much air when your rpm's are low. Electric fans will free up a small bit of HP and are not engine speed dependent like a mechanical fan is so even at low speed and rpm you get maximum air movement through the radiator which will pull more heat out of the system and keep your temps lower. Also run a higher ratio of water to anti-freeze as water is better at heat management than AF and use a product like redline water wetter. Upgrade your trans cooler as well, the stock one is too small imho.