The original motor for WPL RC cars is a 260 motor. Therefore, a lack of torque is unavoidable. For off-road RC cars, to solve the lack of torque, this product comes with a 370 motor for increased torque. With this gearbox, you can easily drive over bumps. You can enjoy powerful driving. Please note that some vehicle models may require modifications to the chassis. We do not provide installation support. Please search for "WPL metal parts installation" on YouTube, as there are many videos available for reference.