It is necessary to have a deep understanding of mechanical systems and motor vehicle construction when designing and developing new equipment and solving noise and vibration problems of gearboxes. Gearboxes are one of the main causes of noise and vibration in cars. In car gearboxes, noise and vibration are mostly caused by shafts, gears, and bearings. Moreover, noise and vibrations in the transfer path of the drivetrain might be brought on by imbalances, misalignments, and other issues. Frequency analysis and order analysis are often used to analyze noise and vibration in automobile gearboxes. Bearing fault analysis involves the use of envelope analysis. The current equipment of the Department of Vehicles and Engines makes it possible to significantly strengthen the experimental part of the vibration and noise of passenger car gearboxes. This paper aims to identify the noise and vibration sources on car gearboxes by frequency analysis and to improve the reliability and maintainability of gearboxes in passenger cars. The effect of eccentricity, the clearance of the input shaft bearings, and the clearance of the bearing near the clutch were found in traction for all speed degrees. In backward, the effect of eccentricity was found for all speed degrees.