The variation of the tooth meshing stiffness is a source of noise and the exact calculation of tooth form is important for the stiffness determination. For this purpose@ software was written with the concept of an unlimited number of tools such as hobs@ grinding disk@ and honing defining a manufacturing sequence. The tooth shapes after each step to show the material removal@ sliding and rolling vectors to optimize the tool life are determined. Additionally@ meshing stiffness variation can be improved by optimization of final gear geometry with a calculation of the contact path under load. From this information the meshing stiffness is derived making it possible to study the effect of a proposed profile correction of a gear under different loads. Calculations with AGMA2001 or ISO6336 check the point with the highest root stress. Effect of a grinding notch is also included.