Traxxas TRX-4M High Range Transmission Gear Set. This replacement gearset provides superb all around speeds ideal for conquering steep and aggressive terrain or covering some ground at respectable speeds. Featuring a 16.6:1 reduction ratio this gives you the best of both worlds when it comes to speed and torque. Traxxas offers a variety of gearsets to suit your application that can be used to customize your vehicle to your preferences. Package includes all transmission gears and an 11t pinion.