Traxxas TRX-4M Low Range Transmission Gear Set 40.3:1 Reduction with 11-Tooth Pinion TRX9776R

Overview

The Traxxas Gear Set, transmission, low range (Crawl) with 40.3:1 reduction ratio is a specialist upgrade component designed to transform your TRX-4M scale crawler into an unstoppable rock-climbing machine. This low-range transmission gear set delivers maximum torque and pulling power, making it the essential upgrade for serious RC enthusiasts in the UK who demand uncompromising off-road performance. Whether you're tackling challenging terrain in your back garden or competing at RC events across the country, this Traxxas transmission upgrade gives your 1/18 scale RC crawler the mechanical advantage it needs to conquer obstacles that would otherwise be impossible.

Built to Traxxas' exacting standards and engineered for durability, this transmission gear set represents the pinnacle of crawling performance for the TRX-4M platform. The ultra-low 40.3:1 reduction ratio means your motor's power is multiplied dramatically, converting modest motor speeds into extraordinary torque output. This is the difference between struggling on a rocky hillside and powering through with complete confidence. For RC car enthusiasts in the UK looking to unlock the true potential of their TRX-4M Ford Bronco, Land Rover Defender, Chevrolet K10, or Ford F-150 scale crawler, this is the transmission upgrade that delivers measurable, real-world results.

This specialist transmission component is ideal for crawlers that see regular use on challenging terrain. The complete gear set includes all necessary transmission components plus a new 11-tooth motor pinion gear, ensuring you have everything required to complete the upgrade. RC model shops across the UK stock this essential upgrade, and it's recommended by experienced builders and competition drivers alike who understand that transmission selection is fundamental to crawler performance.

Key Features

• Ultra-Low 40.3:1 Reduction Ratio — This extraordinarily low gear ratio multiplies your motor's torque output by a factor of 40.3, delivering the mechanical advantage necessary for extreme rock-crawling and obstacle climbing that defines competitive crawler performance.
• Complete Transmission Gear Set — Rather than selling individual gears, Traxxas includes all transmission gears needed for a complete rebuild, ensuring proper mesh, backlash, and engagement characteristics for reliable long-term performance.
• New 11-Tooth Motor Pinion Gear — The inclusion of a fresh 11-tooth pinion gear means you can immediately optimise your motor engagement without needing to source additional components, and you'll have a spare pinion for future rebuilds.
• Maximum Rock-Climbing Power — The reduction ratio is specifically engineered for crawling applications where raw climbing power matters more than speed, allowing your TRX-4M to scale vertical surfaces and overcome obstacles that would challenge less capable setups.
• Genuine Traxxas Engineering — As an official Traxxas part, this gear set is manufactured to the same precision standards as the vehicles themselves, ensuring compatibility, durability, and performance reliability across your entire fleet of TRX-4M crawlers.
• Purpose-Built for TRX-4M Platform — This transmission gear set is specifically engineered for the 1/18 TRX-4M chassis, meaning it integrates seamlessly with all compatible TRX-4M variants including Ford Bronco, Land Rover Defender, Chevrolet K10, Ford F-150, and TRX-4MT Monster Truck variants.

Technical Performance

The Traxxas TRX9776R transmission gear set represents the pinnacle of low-range crawler transmission design. The 40.3:1 reduction ratio is achieved through precision helical gears manufactured from hardened steel, ensuring exceptional durability under the extreme loads generated during rock-crawling. This gear ratio transforms the output of brushless or brushed motors into extraordinary low-end torque, allowing your 1/18 scale TRX-4M to climb obstacles that would otherwise be impossible. The gear mesh is engineered with precise tolerances to minimise noise and wear whilst maximising power transfer efficiency. Unlike generic third-party alternatives, Traxxas transmissions are designed in complete harmony with the rest of the TRX-4M drivetrain, meaning you'll experience seamless integration, optimal performance characteristics, and reliability that comes from factory-matched components. The included 11-tooth pinion gear is precision-cut from hardened steel and offers the optimal engagement characteristics with the transmission input gears. Whether you're running a stock brushed motor or upgrading to a higher-performance brushless unit, this transmission will handle the demands of serious crawler work. The gear set is compatible with all current TRX-4M variants, making it an essential upgrade for any serious RC crawler enthusiast in the UK who demands unconditional performance.

What's in the Box

• Complete transmission gear set with all drive gears
• 11-tooth motor pinion gear (new)

Frequently Asked Questions

• What is the 40.3:1 reduction ratio and why does it matter for RC crawler performance? — The reduction ratio refers to how many times the input shaft must rotate to achieve one complete rotation of the output shaft. A 40.3:1 ratio means your motor makes 40.3 rotations whilst the wheels make just one rotation, multiplying torque output dramatically. This extreme low-end power is essential for rock-crawling, allowing your TRX-4M to climb near-vertical surfaces and power through obstacles with ease. Crawlers typically use much lower ratios than speed-focused vehicles because climbing power matters far more than top speed.
• Which TRX-4M models is this transmission compatible with? — This Traxxas transmission upgrade (TRX9776R) is compatible with all 1/18 TRX-4M variants, including the Ford Bronco in all colour options (Area 51, Black, White, Orange, Blue, Red), the Land Rover Defender in all finishes (Silver, Tan, Black, Green, Light Blue, Pink), the Chevrolet K10 High Trail Truck (Red, Black, Blue), the Ford F-150 High Trail Truck (Blue, Black, Brown), and both TRX-4MT Monster Truck variants (F150 and K10 in Blue and Black finishes).
• What does this transmission upgrade replace? — The TRX9776R replaces your TRX-4M's standard transmission, swapping the factory gear ratio for the ultra-low 40.3:1 ratio that prioritises climbing power over speed. You're essentially gearing your crawler for pure obstacle-conquering performance, making it ideal for crawling enthusiasts who regularly tackle challenging terrain.
• Do I need any special tools or expertise to install this transmission gear set? — Whilst professional installation is always recommended, experienced RC enthusiasts with basic mechanical knowledge and standard model-building tools can manage the installation. The transmission teardown and reassembly process is straightforward but requires care to ensure proper gear mesh and engagement. First-time builders might find it helpful to consult installation videos or speak with experienced modellers at their local RC shop in the UK.
• Will this transmission work with both brushed and brushless motors? — Yes, the TRX9776R transmission gear set is motor-agnostic and will function with any compatible TRX-4M motor, whether that's a stock brushed motor or a high-performance brushless unit. The transmission simply reduces speed and multiplies torque regardless of the motor type powering it.
• Is this suitable for beginners? — Whilst the transmission upgrade itself is straightforward to understand, installation requires some mechanical confidence and knowledge of gear mesh principles. Beginners might be better served starting with a standard TRX-4M and upgrading after gaining experience, though with careful instructions and patience, installation is achievable for determined learners.
• What is the difference between this low-range transmission and a standard TRX-4M transmission? — The key difference is the gear ratio: this low-range set delivers 40.3:1 reduction compared to standard ratios, generating dramatically higher torque at the cost of maximum speed. Low-range gearing is specifically engineered for crawling applications where obstacle-climbing power is paramount, whilst standard gearing balances crawling ability with modest forward speed capabilities.

Why Buy from RC Model Shop?

RC Model Shop is a trusted UK RC retailer and authorised dealer for all the brands we stock, including Traxxas, ARRMA, Losi, FTX, Hobbywing, Spektrum and more. Based in Walsall, we have a physical store where customers are welcome to come in, view products and purchase in store. Whether you are a seasoned competitor, a weekend basher, or just discovering the world of RC for the first time, our team of experienced RC enthusiasts is here to help you find the perfect setup and provide ongoing support. Order the Traxxas Gear Set, transmission, low range (Crawl) (40.3:1 Reduction ratio) / pinion gear, 11-tooth TRX9776R today with confidence, knowing you are buying from an authorised retailer with genuine products, expert knowledge and a commitment to customer satisfaction. Shop online or visit us in Walsall — we look forward to helping you get the most out of your RC experience.