Do I have the DT466 or the DT466E? I'm trying to find out if mine has the Exhaust back pressure sensor in it?
97 is most likely the 466E, it should be clearly labeled on the engine EPA label located on the valve cover. It should cover the engine family, horsepower, torque, emission compliance level, etc. If you do not still have the emission label on the valve cover the dealer can tell you by VIN number, or look and see if your engine has the ECM computer, the older 466 engines were mechanical not computer controlled.
