Pro-Built Speed Transmission and Motor

Boost the top end of your TRX-4M^® with this Speed transmission. The transmission features a high 9.7:1 reduction ratio for maximum speed. Traxxas Pro Built^® transmissions come professionally assembled with a fresh new Titan^® 180 87-turn motor. There’s no gear mesh to adjust or parts to align. The assembly bolts in as a complete unit for quick and easy installation.