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What rpm is it running when it is screaming? The V8's have a higher rpm redline and will run higher rpm both uphill and when tow/haul is downshifting to hold back the speed. My 2005 Ford used to scream at 3800 rpm or even a little more but redline was about 4200 rpm. My Dodge (2007) is an inline six with a redline of 3200 rpm so no way is going to get that high. Today we came down a very long and steep grade with tow/haul, exhaust brake, and cruise all on. We started at the top at 60 mph (cruise setting - 55 mph speed limit on us in California).. anyhow, the truck held it and the Montana to 63 mph at 2500 rpm in fourth gear. In other words, it downshifted twice. I do not even touch the brake in those situations unless perhaps we have a hairpin curve coming up. No need to. The tow/haul and exhaust brake handle things just fine. All touching the brakes does otherwise is shut off the cruise. I suspect what you're seeing is normal for the V8 diesel. They're built to handle the higher rpm.
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