RPM at 60 mph

Either the tach is way off, or the tranny is slipping badly. With a 3.23 gear I would expect 2500 RPM or so. There are websites with formulas that you can use to see exactly what the RPMs should be. You need to start with the diameter of the tires, of course. Here is one of them: http://www.4lo.com/calc/geartable.php