Overview
The Traxxas Gearbox housing (front & rear) for the #9891 transmission is an essential replacement and upgrade component for TRX-4M owners looking to maintain or enhance their RC crawler. This genuine Traxxas part is specifically engineered to work with the High/Low 2-speed transmission system, providing the structural foundation for one of the most capable rock-crawling drivetrains available in the RC car UK market today. Whether you're a dedicated off-road enthusiast pushing your RC model to its limits, or a weekend basher who needs reliable spares, this gearbox housing ensures your TRX-4M transmission operates with precision and durability.
Traxxas has earned its reputation as a leading RC manufacturer through relentless attention to engineering quality and real-world performance testing. The gearbox housing plays a critical role in the overall transmission assembly, housing the internal gears and mechanisms that allow you to select between high and low gear ratios for different driving conditions. For buyers seeking ready to run RC vehicles that deliver genuine off-road capability, having access to genuine OEM replacement parts like this gearbox housing is invaluable for long-term ownership and maintenance. This component is the perfect choice for anyone with a TRX-4M who wants to keep their RC crawler operating at peak performance.
Available now at RC Model Shop with UK delivery, this Traxxas gearbox housing represents an investment in reliability and authentic performance. By choosing genuine Traxxas spares and tune-ups, you ensure compatibility, durability and the engineering excellence that Traxxas customers have come to expect from their RC investments.
Key Features
- Genuine Traxxas OEM Component — This is an authentic Traxxas factory part manufactured to the exact specifications required for the #9891 transmission, ensuring perfect fit and reliable operation with no compatibility concerns or quality surprises.
- Engineered for High/Low 2-Speed Transmission — Specifically designed to house the mechanisms of the manually selectable 2-speed transmission, supporting both high gear for general driving and low gear for incredible rock-crawling torque that makes the TRX-4M such a capable off-road platform.
- Front and Rear Gearbox Housing Set — This package includes both the front and rear gearbox housings required for a complete transmission assembly, making it ideal for comprehensive restoration or upgrades rather than piecemeal repairs.
- Precision Manufacturing — Traxxas gearboxes are manufactured with tight tolerances and quality control, ensuring smooth engagement, minimal backlash and consistent performance across hundreds of hours of use.
- Compatible with Standard and Optional Gears — The housing works with standard gears as well as the optional 9776X speed gear set, giving you flexibility to tune your transmission performance as your skills and needs evolve, though it is not compatible with 9776R crawl gears.
- Essential Maintenance and Repair Part — Keeping genuine OEM gearbox housings in stock means you can quickly address any damage or wear without extended downtime, keeping your TRX-4M ready for action whenever you are.
Technical Performance
The gearbox housing is a critical structural component in the TRX-4M's transmission system. Manufactured by Traxxas using their proven engineering processes, this housing provides the rigid framework that keeps all internal transmission components properly aligned and sealed. The housing design accommodates the High/Low 2-speed transmission mechanism, which revolutionises the way RC crawlers approach difficult terrain. When you select low gear, the transmission delivers significantly increased torque for rock-crawling situations where maximum pulling power is essential; when you switch to high gear, you maintain reasonable speed for general driving and less technical sections. The gearbox housing maintains the precision engineering needed for smooth gear transitions and consistent power delivery. The front and rear housing assembly works in conjunction with the Titan 180 motor (included with complete transmission kits) to create a drivetrain system that balances raw torque with practical usability. All internal mechanisms are protected and properly contained within the housing, which helps keep dirt and moisture away from critical moving parts during off-road use. This is why genuine OEM gearbox housings from Traxxas are so important for long-term reliability — aftermarket or damaged housings can compromise the entire transmission's performance and durability. Whether you are rebuilding after an impact, replacing worn components, or upgrading your TRX-4M's transmission system, this Traxxas gearbox housing ensures you maintain the factory performance standards that make the TRX-4M one of the most respected ready to run RC crawlers available.
What's in the Box
- Gearbox housing (front)
- Gearbox housing (rear)
Frequently Asked Questions
- What is the TRX-4M 2-speed transmission and why do I need this gearbox housing? — The TRX-4M High/Low 2-speed transmission is a manually selectable system that gives you a low gear option for incredible rock-crawling torque and a standard high gear ratio for general driving. This gearbox housing provides the structural framework that houses all the internal transmission mechanisms. If your housing becomes damaged, cracked or worn, replacing it with a genuine Traxxas unit is essential for maintaining proper gear alignment, smooth operation and reliable performance. Without a proper gearbox housing, your transmission will not function correctly, making this a critical maintenance component for any TRX-4M owner.
- Is this gearbox housing suitable for beginners or only experienced RC enthusiasts? — This is a replacement component rather than a complete vehicle or transmission assembly, so it is best suited for users who already own a TRX-4M and either need to replace a damaged housing or are upgrading their transmission system. If you are new to RC and considering a TRX-4M, purchasing a complete ready to run TRX-4M kit is the recommended starting point. However, once you own a TRX-4M, keeping this gearbox housing available as a spare is a sensible investment in uninterrupted enjoyment of your RC crawler.
- What other components do I need to complete a full transmission assembly with this gearbox housing? — This gearbox housing is one part of the complete #9891 transmission system. A full transmission kit includes the gearbox housing (front and rear), internal gears, shafts, bearings and a Titan 180 motor with mounting bracket. If you are replacing only the housing due to damage, you will need to transfer or reuse your existing internal transmission components. For a complete new transmission assembly, you would order the full #9891 High/Low 2-speed transmission kit rather than just the housing component.
- Is this compatible with all TRX-4M models and configurations? — Yes, this gearbox housing is specifically engineered for the TRX-4M platform and is compatible with the #9891 High/Low 2-speed transmission system. The housing itself is transmission-specific rather than model-variant specific, so it will fit any TRX-4M equipped with or upgraded to the #9891 transmission. However, always verify your current transmission part number before ordering to ensure compatibility.
- Can I use this gearbox housing with different gear sets? — The gearbox housing is compatible with standard gears and the optional 9776X speed gear set, giving you flexibility to adjust your transmission ratio and performance characteristics. However, it is not compatible with 9776R crawl gears, so ensure you are using the correct gear set for your chosen housing and transmission configuration.
- What should I do if my gearbox housing becomes damaged during use? — If you notice cracked, stripped or damaged gearbox housing during inspection or after impacts, replace it promptly with a genuine Traxxas replacement. Continuing to use a damaged housing risks internal gear misalignment, grinding, loss of power delivery and potentially catastrophic transmission failure. Keeping a spare gearbox housing on hand is an excellent preventative measure for serious RC crawlers.
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 Gearbox housing (front & rear) (for #9891 transmission) TRX9889 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.
- Product type: Gearbox housing (front and rear pair)
- Brand: Traxxas
- Model number: TRX9889
- EAN: 020334011886
- Compatibility: TRX-4M High/Low 2-speed transmission #9891
- Transmission type: High/Low 2-speed manual selectable
- Features: Front and rear gearbox housing assembly
- Gear compatibility: Standard gears and optional 9776X speed gear set compatible
- Gear compatibility: Not compatible with 9776R crawl gears
- Contents: Gearbox housing front and rear
We want to make sure your delivery goes smoothly, so here are some important details about our service:
- For orders above £120, we offer delivery to most mainland UK addresses. For orders under £120, we can still deliver to Northern Ireland and the outlying isles, as long as the item can be sent by Royal Mail, weighs less than 30kg, and fits within 61cm × 46cm × 46cm. Some highland and remote areas may carry an extra delivery charge as couriers often apply surcharges in these locations. If you live in one of these areas, feel free to contact us before ordering so we can confirm the delivery options and costs for you.
- Most of our products include delivery in the price. If your order is under £90, a small delivery fee will apply but do not worry this will always be clearly shown at checkout before you complete your purchase.
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- If your order includes items with different dispatch times we will normally wait and send everything together once all items are in stock. If one of the items is going to take a while we will give you the choice either wait for everything to arrive or let us send the available items now and deliver the rest later. It is up to you.
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- For customers in Inverness and other parts of the Scottish Highlands deliveries can take up to 2 working days even if you select next day delivery as couriers do not currently offer a guaranteed next day service to those areas.
