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Illapah, I wonder what that mechanic was talking about? I have many times engaged tow/haul above 40 mph, even at 65 when I noticed I forgot to engage it. And it worked fine.
Billy Ray, your Chevy is a 2002. That's before GM went to the variable vane geometry on the turbo. Ford went to that back in 2003 with the 6.0L. But I don't think GM went to the variable until the LBZ in 2006. Someone correct me if I'm wrong. The reason I mention that is without the variable what the tow/haul does on the downgrade is downshift the transmission. That does help, no doubt. But with the variable vane geometry turbo, when off throttle the vanes close, creating a backpressure from the exhaust, like an exhaust brake. Maybe not as strong as an aftermarket brake but very effective. Added to the downshifting of tow/haul, in my opinion it eliminates the need for an exhaust brake. But I don't think your truck has that. I've been wrong before but this is my understanding.
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