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Medic
If the mfg. didn't think the tow haul mode was necessary for your vehicle, they wouldn't have put it on. My advise is "use it". The Allison is virtually indestructible, because of safe guards like the tow haul mode. Plus the fact that it is smarter then a lot of the people who are sitting behind the wheel trying to second guess it. I've owned and towed with a Duramax with the Allison, and I can tell you for a fact, it does not lock you out of high gear (over drive). The tranny will shift into the gear that it knows is right for the situation. Some times it can seem like it won't shift into over drive, but there's a reason. Could even be something as simple as you don't have enough RPMs/speed, or it's working harder than you realize. There are some grades out west that can be very deceiving.
If you want/need more confirmation, stop by your dealership and asked the service manager.
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