What was this truck originally? What was it used for? It may just be geared low, as someone else here pointed out. Is the speedo accurate? What tranny does it have? Usually almost any truck engine is geared to run about 1500-1800rpm at 60mph, depending on the size of the engine and application. Most all fleet trucks are built and set up run 65mph due to fuel economy. It takes a LOT more fuel to go 70mph. The way the ECM works, is when programed to top speed limit of 60mph, when it 'knows' it is in top gear, you could have the top rpm set to 3000, but it will limit rpm to only allow the engine to go 60mph. I cannot remember about a DT466E, specifically, but there a lot of variables that can be programed into an ECM. It has been a bunch of years since I worked on these, but I actually thought that a Navistar 4700 had dip switches on the back of the speedo head, or the cluster, but you need a manual to program them. If not, the ECM may have tire revolutions per mile set wrong. Your top road speed can be reset, but sometimes these are password protected, usually by the owner. Cruise control top speed can be set separately of the (foot feed) top speed. But I would not want to run that engine at a constant rpm above 2000 to achieve higher road speed. Mark.
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