Axletech E88350255 Planetary Sun Gear Spur Assembly

Axletech E88350255 Planetary Sun Gear Spur Assembly is the genuine sun gear used in Axletech planetary gear trains for heavy-duty truck axles. This central gear transmits torque from the input carrier to the planet gears, forming the reduction stage in final-drive assemblies such as Axletech 4000/Rockwell configurations, where precise meshing and robust construction are essential for reliable performance. The part is listed across distributors as E88350255 sun gear, with cross-references including NSN 3020-01-519-1710, facilitating replacement and compatibility checks, and it commonly appears in Meritor/Axletech catalog references as a genuine component. Some listings designate it as a Special Order item and describe it as Meritor Genuine, reflecting its OEM role and the limited availability of this exact sun gear for compatible axle assemblies. In planetary gear systems, the sun gear engages the planet gears and the ring gear to establish the final drive ratio and output speed, a configuration widely used in heavy-truck differentials and axles where Axletech gear sets are employed.