Yep, that's awful high rpm's I'd think. I'm turning 1500 rpm's at 72 mph. I don't know what the cost would be for a change though. You'd have to weigh that against the possible fuel savings to decide if it's worth it. I'd find a good independent truck repair place and see what they'd charge you for a gear change. I think mine is 3.55 ratio in case that helps you.
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'03 Freightliner FL112, 295" wheel base, with '03 United Specialties 26' living quarters, single screw, Cat C12 430 h/p 1650 torque, Eaton 10speed , 3.42 rear axle ratio
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