This is a Traxxas Revo 2.5 and 3.3 Forward Only Conversion Kit. Because you eliminate the reverse gears, there is less rotating mass in the transmission, which lets the truck accelerate quicker. This is a common option for racers. This is a must for any serious Revo driver who wants to squeeze more performance out of their truck, while also shedding the extra weight of the reverse servo.
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