I don't know. What I do know is that the gassers shift down, and rev higher, causing the exaust gasses to get much hotter. Transmission also gets a lot hotter. Everything gets much hotter. When I pull hills (Now I'm talking towing here) with a gasser, I can smell the heat, and hear the metal expanding/contracting. Transmission temps reaching 200*+, and that's not pushing it. It's the heat that is the killer. I can't believe GM (or any others) are making a gasser that won't get HOT towing hills. My diesel shifts up pulling the same hills, with the same loads. Transmission temps are around 130* - 140*. No hot smell, etc.. A night & day difference. It will float up the hills, not shift down & rev. Why do you think the choice for big rigs is diesel? Diesels rev less, run cooler, and have way more torque. EXAMPLE: A GM 6.0 has around 350 foot pounds of torque. My 2011 Duramax has 765 foot pounds of torque. That's more than double the torque. A diesel engine will out live a gasser 3 to 4 times. They get better milage than a gasser doing the same job. The fuel cost more now, so that's kind of a wash.
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Today's Featured Article - History of the Nuffield Tractor - by Anthony West. The Nuffield tractor story started in early 1945. The British government still reeling from the effects of the war on the economy, approached the Nuffield organization to see if they would design and build an "ALL NEW" British built wheeled tractor, suitable for both British and world farming.
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