Greg;
We are looking at an engine that may be down on max allowed governed speed under full load. The engine's full load hydraulic dead head (mast tilted back and held) to see engine's speed holds at full load governed speed. If it does, you have a stator problem in the Diakin 2 speed transmission. Check pressures of trans. with oil at normal temperature and engine's speed at 1000 RPM. The main pressure should be 145-185 psi, the FWR 1 will be 142-185 psi and the FWR 2 will be the same. Also, the REV should be at 142-185 psi. The converter (IN) pressure will be 43-85 psi.