The ServoCity 5103 Series Planetary Gearbox (3.7:1 Ratio, 24mm Length 8mm REX™ Shaft) serves as a direct replacement for the gearbox in the 5203-2402-0003 Yellow Jacket Planetary Gear Motor. This gearbox is designed with a robust 8mm REX™ output shaft, ensuring compatibility with various 8mm REX components. It features the goBILDA pattern on its face, which facilitates seamless integration with other components. Additionally, the gearbox includes clearance cuts to accommodate nearby parts, enhancing its versatility and ease of use in complex assemblies.