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Due to improving levels of vehicle refinement and the growing importance of vehicle sound quality, transmission whine is an issue of increasing interest to vehicle manufacturers. This paper describes the development of a set of novel tools for the prediction of gear whine from spur and helical external gear systems. Transmission whine is primarily generated by transmission error, which is a deviation of meshing gears from a perfectly conjugate (smooth) motion due to manufacturing tolerances, tooth corrections and elastic deflection due to transmitted torque. The transmission error excites the geared shaft and bearing system leading to dynamic forces at the bearings, which in turn excite the transmission casing causing it to radiate noise.