My '08 has 8k miles, and is used exclusively for pulling a 9k # fifth wheel in the Sierras. Usually the downhills are slight and constant, and the EB and tranny work in harmony. Yet, on our most recent return from a new campground, the downhills were intermixed with slight upgrades and flats. Hence the transmission was constantly shifting, at times making several shifts per minute. Overall it probably shifted at least two hundred times in the one hour it took to make it down the mountain.

The truck is totally stock, and I am not able to monitor tranny temps and the like, however no idiot lights came on, and everything was within the normal operating range. Could all this shifting be creating possible transmission problems?

 

My 2011 is my first automatic truck in many years but what I have been doing when towing my 13XXX 5ver in the mountains is using it like a manual transmission and doing the shifting for it. Why wait until the engine starts to bog down when you can shift it before hand and keep the rpm up. I notice the fuel burn is noticeably better at that point in time when doing it this way.

 

Also, limiting the range of shifting helps. I've done this numerous times with success.

 

Use the + - button to drive it like a manual. I got an Auto, easier than a divorce, so my wife is happy. I do not like an auto in a truck but the +- buttons make it much better.

 

I do the same. Figured it out when I was not downshifting in tow haul mode. ****** me off so I started using the buttons to keep the RPMs and speed up.

This truck does not like to downshift at all I have found.