INJORA CNC Aluminum Transmission for 1/18 TRX4M — 370 Brushed Motor 45T Upgrade

Upgrade your 1/18 scale crawler with the INJORA CNC Aluminum Complete Transmission, equipped with a 370 Brushed Motor 45T. This upgrade blends a beefy, heat-tolerant design with precise gearing to help you tackle challenging rock sections, steep ledges, and tight trails with more confidence. The tall transmission physically accommodates the larger 370 motor, while the CNC aluminum housing delivers a rigid, consistent alignment for smooth gear mesh and lasting performance on long crawls. Built to withstand outdoor use, this unit also features weather-resistant construction that helps you push through light rain and muddy sections without hesitation.

Key features and versatility

• Note: Not compatible with the stock TRX4M ESC as it is too weak; compatible with INJORA MB100 ESC
• The 370 brushed motor (45T) delivers steady torque at crawl speeds for better control
• CNC aluminum machined transmission housing yields a taller design to fit 370 motors
• Includes ball bearings and 24.4:1 metal gears with underdrive 32% for crisp gearing
• IPX6 waterproof rating protects electronics from rain and splashes during outdoor runs

The high-strength neodymium magnets inside the motor contribute to stronger drag braking and more immediate torque delivery than the stock setup, helping you maintain control on steep drops and sputtering rocks. The included 24.4:1 metal gear set is tuned for this motor and the overall kit, designed to deliver consistent performance when you need precise slow-speed handling. The gear arrangement is intended to pair with the included gears and should not be mixed with other ratios, ensuring you maintain the intended balance of torque and wheel speed. This upgrade is targeted at the TRX4M platform, with a transmission tall enough to clear the motor and leave room for reliable mesh and cooling when crawling through rough terrain.

Real-world use and outcomes

• Sealed construction reduces debris ingress and supports all-weather crawls
• Pair with MB100 ESC for tuned throttle response and reliable control
• Better torque control can help with line choices on difficult sections
• Rugged build minimizes wear during repeated hill climbs and rock traverses

While this transmission is designed to enhance performance on the 1/18 TRX4M, results will vary based on configuration and driving style. Consider this upgrade as a pathway to more torque, improved drag brake, and a sturdier drivetrain if you routinely encounter challenging terrain or weather exposure. For best results, match with the recommended ESC and follow the included gearing guidance to maintain optimal performance and durability over time.