This standard provides the engineer, who is familiar with gear designing, a guide to sound design approaches for vehicle gear applications. Through this standard, the engineer is guided to selecting design considerations paramount to the parallel axis gear sets required in vehicle drive lines. These include tooth and blank proportions, metallurgy, lubrication, profile and lead modification requirements, and gear tooth tolerances. Properties of the commonly used steels and processes for their heat treatment are outlined, as well as details for calculating design limits for bending and contact stresses.