Overview
The Traxxas Two Speed Shift Assembly (TRX9890) is an essential replacement component for owners of the Traxxas TRX-4M two-speed transmission system. This precision-engineered shift assembly is designed to restore full functionality to your transmission, whether you're replacing worn components after extensive use or upgrading your RC crawler for improved performance. As an authorised Traxxas retailer serving the UK RC community, we understand that maintaining your RC car with genuine OEM parts is crucial for reliability and longevity. This shift assembly represents genuine Traxxas engineering and quality, ensuring your rock crawler or scale RC vehicle performs at its best on challenging terrain.
For serious RC enthusiasts who demand authenticity and performance from their Traxxas vehicles, this replacement shift assembly is an investment in dependability. Whether you run your TRX-4M through rocky trails, technical climbing courses, or competitive events, having access to genuine Traxxas replacement parts means you can keep your RC model in peak condition. The two-speed transmission system is a hallmark feature of the TRX-4M platform, offering drivers the ability to select between different gear ratios for optimal performance across varying terrain and driving conditions. When your shift mechanism requires replacement, choosing an official Traxxas component ensures perfect compatibility and reliable operation.
Available now from RC Model Shop, your trusted UK supplier of genuine Traxxas parts and RC vehicles, this shift assembly comes backed by our commitment to quality and customer satisfaction. Whether you're a dedicated rock crawler competitor, a weekend basher exploring challenging landscapes, or a collector of premium scale RC models, we stock the complete range of Traxxas TRX-4M components and accessories to keep your vehicle running smoothly.
Key Features
- Complete Shift Assembly Kit — This comprehensive replacement package includes everything required for a full shift system installation: the shift dog, shift fork, transmission mount, and four precision 2x6mm socket head cap screws, eliminating the need to source individual components separately.
- Genuine Traxxas Engineering — Manufactured to OEM specifications by Traxxas, the world-renowned leader in RC vehicle technology, this component is engineered for perfect fit and function with your TRX-4M two-speed transmission.
- Precision Shift Dog Design — The shift dog component is critical for smooth gear engagement in the two-speed transmission system, enabling reliable shifting between low and high gear ratios for adapting to different terrain and driving styles.
- Durable Shift Fork — The shift fork mechanism provides positive engagement with the transmission gears, ensuring crisp, consistent shifting performance whether you're climbing rocky obstacles or navigating technical trails.
- Integrated Transmission Mount — The included transmission mount ensures proper alignment and secure installation of the shift assembly to the TRX-4M transmission housing, maintaining structural integrity and shifting accuracy.
- Quality Fasteners Included — Four 2x6mm socket head cap screws (BCS) of premium quality are included, manufactured to Traxxas specifications for reliable long-term assembly security.
- Direct Compatibility — Designed specifically for the Traxxas TRX-4M model, this shift assembly integrates seamlessly with the #9891 transmission system, ensuring no modifications or adaptations are required.
Technical Performance
The Traxxas Two Speed Shift Assembly represents precision mechanical engineering designed to handle the demanding requirements of modern RC crawling and rock bouncing. The shift dog and shift fork work in concert to engage and disengage the transmission's internal gear sets, allowing drivers to switch between low-range and high-range ratios on-the-fly or statically, depending on transmission design. The materials and tolerances used in Traxxas components are engineered for durability under the stresses of aggressive off-road driving, whether climbing steep inclines, navigating obstacle courses, or bashing through rocky terrain. The transmission mount component ensures rigid, vibration-free installation, preventing any deflection that could cause shifting inconsistencies or mechanical play. Each of the four included 2x6mm socket head cap screws is manufactured to precise specifications, providing secure fastening without risk of stripping or loosening during use. The shift assembly integrates with the TRX-4M's overall transmission architecture, which is designed around a two-speed system that provides significant gear ratio flexibility. This engineering allows TRX-4M owners to optimise their vehicle's performance for specific terrain types, from tight technical courses requiring low-range power delivery to more open areas where higher-speed cruising is preferred. When component wear or damage occurs, replacing the shift assembly with this genuine Traxxas replacement ensures the transmission returns to factory performance specifications, restoring the crisp, positive shifting characteristics that Traxxas vehicles are known for. The assembly's quality directly impacts the reliability and responsiveness of your RC vehicle's drivetrain, making it one of the more important maintenance components for serious RC enthusiasts.
What's in the Box
- One shift dog
- One shift fork
- One transmission mount
- Four 2x6mm socket head cap screws (BCS)
Frequently Asked Questions
- Is the Traxxas TRX9890 shift assembly compatible with my RC transmission? — This shift assembly is specifically designed for the Traxxas TRX-4M model and works with the #9891 transmission system. If you own a TRX-4M, this is the correct replacement part. For other Traxxas transmission systems, please verify compatibility by consulting the manufacturer's parts diagram or contacting our team, as we stock replacement components for many Traxxas transmission types.
- What tools will I need to install this shift assembly? — You will need a socket or Allen key appropriate for the 2x6mm socket head cap screws included in this kit. Standard RC hobby tool sets typically include these sizes. A small Phillips or flathead screwdriver may be helpful for removing and installing the assembly, depending on your transmission design.
- How long does it take to replace the shift assembly? — For experienced RC enthusiasts with basic mechanical knowledge, replacement typically takes 15-30 minutes, depending on your familiarity with the TRX-4M transmission layout. If you've never serviced your transmission before, allow additional time to consult your vehicle's manual and ensure all fasteners are properly torqued.
- Why would I need to replace this shift assembly? — Like all mechanical components subjected to repeated use, shift assemblies can wear over time. Common reasons for replacement include shift dogs that become stripped or rounded, shift forks that bend or crack, or transmission mounts that crack or loosen. If your two-speed transmission isn't shifting smoothly or has stopped responding to shift commands, the shift assembly is often the culprit.
- Can I use aftermarket shift assemblies instead? — Genuine Traxxas components are engineered to precise tolerances that ensure reliable operation and long service life. Whilst aftermarket alternatives may appear to work initially, genuine Traxxas parts offer superior quality control and compatibility guarantees, making them the preferred choice for serious RC enthusiasts who prioritise reliability.
- Where can I find the #9891 transmission number on my vehicle? — The transmission part number is typically found in your TRX-4M's manual or on the transmission housing itself. If you're uncertain whether your transmission is compatible, we recommend contacting our RC Model Shop team with your vehicle's model details, and we'll help you identify the correct parts.
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 Two speed shift assembly/ shift dog/ shift fork/ transmission mount/ 2x6mm BCS (4) (for #9891 transmission) TRX9890 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.
- Brand: Traxxas
- Model Number: TRX9890
- Product Type: Two-Speed Transmission Shift Assembly
- Vehicle Compatibility: Traxxas TRX-4M
- Transmission Compatibility: #9891 transmission
- Components Included: Shift dog, shift fork, transmission mount
- Fasteners Included: 2x6mm socket head cap screws, quantity 4
- Scale: Fits TRX-4M 1/10 scale model
- Material: Precision-engineered components suitable for transmission service
- Installation: Requires basic RC hobby tools and mechanical knowledge
- Service Level: Replacement component for two-speed transmission system
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.
- Depending on what you choose at checkout, your order will usually be delivered either the next working day or within 2 working days. For next day delivery please place your order before 2:00pm. Orders are dispatched Monday to Friday only. Some items may take a little longer and if that is the case we will always show the expected delivery time on the product page.
- 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.
- We use trusted delivery partners to make sure your order gets to you safely and on time. We use DPD for next working day deliveries and Royal Mail for the 2 day option.
- As soon as your order is on its way we will send you a tracking number by email. If you provide your mobile number at checkout we will also send delivery updates straight to your phone so you can keep an eye on progress.
- If a product is marked as "Dispatched within 3 working days" delivery usually takes around 3 to 5 working days from when your order is placed.
- 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.
