[harper223]

So I'm pulling my 9300 pound travel trailer up a fairly steep grade out of Palo Duro Canyon State Park in the panhandle of TX. Now I dont know what the % grade was exactly, but it had to be at least 10%. I was in the Tow/Haul mode and forgot that I was in OD going up the hill. Normally I would have manually gone to 1st or 2nd with the six speed auto. I swear that truck never shifted down all the way up that hill. AS I was beginning to crest it was struggling to get to the top, but we did- and I had reached my target heart rate for the day.

What gives? Shouldn't that tranny downshift for me as a keep pressing down on the gas? I'm under my weight limits for towing as well. 3,000 miles till the warranty is up too.

08 crewmax 5.7 TRD