This is a Pre-Built Performance Transmission for Slash® 2WD, Electric Stampede® 2WD, Electric Rustler® and Bandit®*. The 2WD Slash® is one of the most important and successful vehicles in the History of RC because it brought affordable scale realism to the masses. Since its release, racers have been modifying and hopping up every aspect of the vehicle to improve its performance but they have always been stuck with the heavy, non-adjustable and non-racing inspired transmission… until now! After over a year of design, development and testing, Pro-Line is proud to release the Performance Transmission, which has been specifically designed to bring your Slash® up to racing specifications. Every feature you would expect to find in a high-end race transmission is now available for your Slash. This new Performance Transmission is also a great addition to your Electric Stampede® 2WD, Electric Rustler® and Bandit®*!