Manganese based oxides are of great interest for both spintronic and multiferroic applications.Pb2MnO4 crystallizes in the acentric but non-polar space group P-421c which allows piezoelectricity. Pb2MnO4 also shows antiferromagnetic order below TN = 18K. The magnetic spacegroup P-421c is compatible with piezomagnetism making Pb2MnO4 a candidate multipiezo(piezoelectric and piezomagnetic) material. Magnetization and Resonant Ultrasound Spectroscopy (RUS) measurements reveal a change in magnetic order and perhaps crystal symmetry in applied fields > 4 T. We request 1 day to measure high resolution NPD patterns at temperatures between 2 and 50 K under applied magnetic fields up to 7 T.