Package List:1 * Reverse Transmission BoxMany vehicles are only equipped with ordinary gearboxes with only one output shaft shared by the front and rear axles; In this case, the shafts of the front and rear axles rotate unidirectionally and exert an obvious counteracting action on the gearbox as part of the vehicle body; Therefore, the vehicle can lean towards one side under the counter when moving forward or climbing, and the greater the shaft output torque, the greater the opposite action, the more the vehicle body leans to one side. The vehicle may lean towards the other side when it moves backwards. The counter-gearbox is designed to eliminate the "shaft-induced effect" by adding another gearbox positioned on top of the gearbox in the same ratio that allows one shaft to rotate in the oppisite direction, In this way, the opposing actions performed by the front and rear output shafts are mutually opposed. Specifications:Item Name: Reverse Gearbox Suit for: 1/10 Track RC Car Axle SCX10 90027 SCX10 II 90046 WRAITHMagerion: Metal 87T 48P Gear Motor Shaft 20T 48PKolor: Titanium Size: As the picture showNote:1. This is a spare parts for retrofit, suitable for 313mm wheelbase frame, WRAITH or other wheelbase frames, to install this gearbox, please shorten the rear drive.2. Only the gearbox, no others.