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[wontonrunner]

Unless i missunderstood my manual when i read it, our 6.4 does already have assisted braking during the tow/haul mode. When in tow haul mode, when you brake the computer takes over and it controls your shifting and it modifys the exhaust valve timing to ensure your vehicle does not exceed a certain speed. I will have to look again and see if i can find it.

I know that if i am in tow haul mode...my truck will slow down on its own going down a grade when i let off the gas and tap the brake and it slows down a lot faster on level ground when i let off the gas and tap the brake as well.