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 bearings and a fresh new Titan® 180 87-turn motor.

Give your TRX-4M™ unstoppable torque with this low-range transmission. The transmission features an ultra-low 40.3:1 reduction ratio for maximum rock-climbing power.

The Pro Built® high range (standard) transmission comes professionally assembled with bearings and a fresh new Titan® 180 87-turn motor.

Rear bumper mount, XRT

Each brass wheel weight adds 31 grams to the lowest part of your TRX-4M™ for improved anti-rollover stability and superior rock-climbing capability.

Replacement ring and pinion gears from the front and rear axles

Boost the top end of your TRX-4M™ with this Speed gear set. The gear set features a high 9.7:1 reduction ratio for maximum speed. The set includes all transmission gears and a new 11-tooth motor pinion.