Overview
Give your TRX-4M unstoppable torque with this Traxxas low-range transmission, specifically engineered to deliver maximum rock-climbing power to your 1/18 scale RC crawler or trail truck. Whether you're tackling steep inclines, navigating rocky terrain, or pushing through challenging off-road obstacles, this complete transmission assembly transforms your TRX-4M's performance with an ultra-low 40.3:1 reduction ratio that prioritises crawling ability over speed. This is the ultimate upgrade for serious RC rock crawlers and trail enthusiasts across the UK who demand the best performance from their TRX-4M platform.
For UK RC hobbyists looking to maximise their vehicle's torque and climbing capability, this Traxxas transmission represents a significant step forward in drivetrain technology. The transmission arrives as a fully assembled, professionally built unit that installs in minutes—there's no complex gear mesh adjustment or time-consuming parts alignment required. Simply bolt it in as a complete assembly and you're ready to hit the trails. This ready-to-install approach makes it ideal for both experienced RC enthusiasts and those newer to RC car UK hobby modifications who want premium performance without the technical complexity.
Traxxas Pro Built transmissions are renowned for their quality construction and reliability. This complete transmission includes a fresh new Titan 180 87-turn motor, providing the ideal torque characteristics for low-speed, high-power climbing applications. If you own a TRX-4M Ford Bronco, TRX-4M Land Rover Defender, TRX-4M Ford F-150, TRX-4M Chevrolet K10, or TRX-4MT Monster Truck variant, this transmission upgrade will unlock capabilities you never knew your RC vehicle possessed.
Key Features
- Ultra-Low 40.3:1 Reduction Ratio — This exceptionally low gear reduction is purpose-built for maximum rock-climbing torque and slow-speed control, making it the perfect choice for serious RC crawlers navigating challenging terrain where precision and power matter most.
- Professionally Assembled Unit — Traxxas Pro Built transmissions arrive completely assembled with all components aligned and ready to install, eliminating the need for any complicated gear mesh adjustments or time-consuming manual alignment work.
- Included Titan 180 87-Turn Motor — The transmission package includes a fresh new Titan 180 brushed motor with 87 turns, which is specifically optimised for the high-torque, low-speed characteristics needed in climbing applications and provides excellent power delivery across the entire RPM range.
- Complete Gear Set — All necessary transmission gears are included, plus a new 11-tooth motor pinion, giving you everything required for installation without additional purchases.
- Bolt-In Installation — The entire assembly bolts in as a single unit, making installation quick and straightforward with no complex adjustments needed, meaning you can upgrade your TRX-4M and get back to driving faster than ever.
- Maximum Rock-Climbing Power — The combination of the ultra-low reduction ratio and included Titan 87T motor creates unmatched low-end torque, allowing your TRX-4M to climb steeper angles and navigate more challenging obstacles than the standard transmission.
- Traxxas Quality Engineering — Built to Traxxas standards for durability and performance, this transmission is engineered to withstand the demanding conditions of trail and crawl driving, ensuring longevity and reliability on every expedition.
Technical Performance
This complete transmission assembly represents serious engineering optimisation for the dedicated rock crawler and trail truck enthusiast. The 40.3:1 reduction ratio is specifically calculated to deliver maximum mechanical advantage at low speeds, transforming your TRX-4M into a genuine terrain-conquering machine. The included Titan 180 87-turn brushed motor is engineered to produce exceptional torque characteristics at low RPM, making it the perfect partner for the transmission's climbing gearing. The motor features 87 windings designed specifically for crawling applications where sustained torque matters more than outright speed. All gears and the 11-tooth motor pinion are precision manufactured to Traxxas specifications, ensuring smooth mesh, quiet operation, and reliable power transfer through even the most punishing terrain. The professional assembly means each component is perfectly aligned from the factory, with bearing surfaces properly seated and gear mesh optimised before it leaves the factory. This attention to detail translates directly to smoother operation and longer component life compared to manually assembled alternatives. The complete unit is designed for the TRX-4M platform, which is already renowned as one of the finest 1/18 scale crawler platforms available for UK RC enthusiasts, and this transmission upgrade elevates that platform even further.
What's in the Box
- Complete low-range transmission assembly (fully assembled)
- All transmission gears
- New 11-tooth motor pinion
- Titan 180 87-turn brushed motor (professionally installed)
Frequently Asked Questions
- What makes this transmission different from the standard TRX-4M transmission? — The standard TRX-4M transmission offers a standard gearing ratio for general purpose crawling and trail driving. This low-range transmission features an ultra-low 40.3:1 reduction ratio that prioritises maximum torque and climbing power, making it the choice for serious rock crawlers and those tackling extreme terrain. The included 87-turn motor is also optimised specifically for this gearing rather than being a general-purpose motor.
- Is this transmission suitable for beginners to RC crawler modifications? — Yes, absolutely. Whilst this is an upgrade transmission meant to improve performance, the installation process is very straightforward. The transmission arrives fully assembled and bolts in as a complete unit with no gear mesh adjustment or complex alignment needed. Any RC enthusiast with basic mechanical skills and a few common tools can install this in their TRX-4M.
- Which TRX-4M models is this compatible with? — This transmission is compatible with all TRX-4M variants including the Ford Bronco (available in Blue, Red, Orange, Black, White, and Area 51 colours), Land Rover Defender (available in Green, Light Blue, Pink, Silver, Tan, and Black), Ford F-150 High Trail (Brown and Black), Chevrolet K10 High Trail (Blue, Red, and Black), TRX-4MT F150 Monster Truck (Black and Blue), and TRX-4MT K10 Monster Truck (Red and Black).
- What motor does this transmission include? — The transmission includes a fresh new Titan 180 87-turn brushed motor. This motor is specifically engineered for crawling applications and provides the ideal torque characteristics to complement the 40.3:1 reduction ratio for maximum rock-climbing performance.
- Do I need any additional parts to install this transmission? — The transmission arrives as a complete assembly with everything included. You will need your TRX-4M vehicle and basic RC tools, but no additional transmission parts or components are required for installation.
- What is the benefit of the 40.3:1 reduction ratio? — The 40.3:1 reduction ratio provides enormous mechanical advantage, allowing the motor's torque to be multiplied significantly. This enables your TRX-4M to climb steeper angles, maintain better control over obstacles, and generate the raw power needed for serious rock crawling and technical trail driving. The trade-off is reduced top speed, but for crawlers and trail trucks, the increased climbing ability is far more valuable.
- How long does installation take? — Since the transmission arrives fully assembled as a complete unit, installation typically takes under an hour for most users with basic mechanical experience. Simply remove the old transmission, bolt in the new assembly, connect the motor, and you're ready to drive.
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 Transmission, complete (low range (crawl) gearing) (40.3:1 Reduction ratio) (includes Titan 87T motor) TRX9791R 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.
- Manufacturer: Traxxas
- Part Number: TRX9791R
- Transmission Type: Complete low-range transmission assembly
- Gear Reduction Ratio: 40.3:1
- Compatible Models: TRX-4M platform (all variants including Ford Bronco, Land Rover Defender, Ford F-150, Chevrolet K10, and TRX-4MT Monster Trucks)
- Motor Included: Titan 180 brushed motor
- Motor Configuration: 87-turn
- Motor Pinion: New 11-tooth motor pinion included
- Transmission Gears: Complete gear set included
- Assembly Status: Professionally pre-assembled, ready to install
- Installation: Bolts in as complete unit, no gear mesh adjustment required
- Bearings: Included in professional assembly
- Application: Rock-climbing and trail crawling
- Build Quality: Traxxas Pro Built standard construction
- EAN: 020334979186
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