For those of you who keep turning off tow/haul because the RPMs are high decending a hill, you need to just leave things alone. The ECM will not allow the engine to over rev and will up shift the transmission if needed. BTW, the engine redline for the v10 is 5500 RPM. I've gone down some long 10-12% grades in Tow/Haul with the Tach sitting at 5000 the whole way - and everything is fine. If you don't do it this way and use your brakes, you can easily overheat them. Let the transmission do what it is supposed to.
