A planetary gear system consists of a central gear called the sun gear and a set of planet gears that spin around it. The system is encircled by a ring gear. It may accomplish large reduction ratios while remaining very small. The impacts exerted on the gear system are susceptible to a wide range of manufacturing mistakes. An in-depth analysis of planetary gearbox design is first conducted in this research. Following the design phase, this study employs the finite element approach to probe the stress fluctuation caused by misalignments. Misalignments caused by tolerances on the centre distance between gears and components are the source of the strains in this case. This document provides a literature review of studies that have focused on planetary gearbox analysis and design.