The object of this article is to propose a simplemethod to reduce the transmission error (T.E.) for a given spur gear set@ at the nominal torque@ only by means of the profile modification parameters. Iterative simulations with advanced software@ are needed. A hybrid method has been used@ combining the Finite Element technique with semianalytical solutions. A 2D analysis is thought to be adequate for this kind of work@ in fact@ this software requires both little time for model definition and simulations@ with a very high precision of the results.