Yes Bert, correct in all of your reply, we are on the "same page" here. Note that in almost all cases in my experience, gear pumps have equal size gears, but, typical of the Germans, they must be different ! I suspect that the newer gear design with more teeth is slightly more efficient as there is less bypass possible across the ends (faces) of the gear teeth. I suspect the pressed steel impeller is a more efficient design to compensate for the lower rpm's. I also suspect that delivered oil pressure (after the relief valve) is the same as with the old design, possibly with less by-pass over the relief valve. Someone may have indicated oil pressure figures for us ?? I have a test gauge but have never taken the time to connect it and test. I reckon Ajays would know the oil pressure, I bet he has it recorded somewhere !