Torque converter lock up.
I have been inclined to look at the Ram Cummins because of it's manual transmission availability. I always thought it would give better EB on the steep two lane mountain roads that I travel on. But...
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Try to find a guard rail. There aren't any. Not enough room. But if you were coming from the east of the Sierras to Yosemite. That's the only road you could take and make the trip in a weekend.
