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I do have an automatic high idle with the crane, but I disengaged it at the air piston and control it manually. I drive around with the transfer case on the floor. Never figured out what the upper (above neutral) position does, other than bang my ankle.

It sounds too shallow to be that, and I also just had this engine fully rebuilt. It sounds like it is under the cab, not in the engine.

Governor at 2200, right at 58 mph indicated. I got it up to 61 once and it felt like I was re-entering earth's atmosphere. Also, re-read my post. I edited to provide more info.

My 1984 M936 has a terrible rattle at highway speed- but only when the engine is at governor and I go down a slight downhill. At normal cruise it's fine, but when I go to a slight downhill--only enough to put the engine/driveline in a neutral load-- it will rattle like a bunch of bolts in a...