This product is a differential gear set designed to rebuild or restore the internal gearing of the differential in compatible Traxxas RC vehicles. The kit includes two output gears, four spider gears, two spider gear shafts, two output shafts, and two 2.5×13.8 mm pins, providing all the internal components required for a full differential gear replacement. Precision-machined metal gears ensure smooth torque distribution between the left and right wheels while improving drivetrain durability under high-power brushless systems. It serves as a direct replacement part to maintain reliable power transfer and traction during off-road driving and high-speed operation. RC car compatibility includes the Traxxas Maxx 1/10 4WD monster truck models such as Maxx (89076-4) and Maxx (89086-4).