Overview
The Traxxas Ring Differential / Pinion Gear Differential (12 / 47 ratio) (Rear) TRX6779 is an essential drivetrain spare part for Traxxas RC models. This genuine OEM component represents the quality and precision engineering you would expect from Traxxas, one of the world's most respected manufacturers of hobby-grade RC cars, trucks and buggies. Whether you are maintaining your existing Traxxas RC vehicle or upgrading your drivetrain performance, this rear differential assembly is a critical component that directly affects acceleration, top speed and handling characteristics.
Built to exact Traxxas specifications, the ring and pinion gear differential is a wear item that may need replacement after extensive use, or can be upgraded as part of a performance tuning project. The 12/47 gear ratio is specifically engineered for certain Traxxas models, providing the optimal balance between acceleration and top speed for medium to high-speed driving. For RC enthusiasts across the UK looking for reliable, OEM-quality replacement parts, this differential assembly delivers the durability and performance consistency that serious RC hobbyists demand.
RC Model Shop stocks genuine Traxxas spares and replacement parts, ensuring you always have access to authentic components that maintain your RC car's factory performance standards. As an authorised Traxxas dealer, we supply only genuine parts with full manufacturer backing, so you can be confident you are getting the real thing.
Key Features
- Genuine Traxxas OEM Component — This is an original manufacturer part designed and engineered by Traxxas, ensuring perfect compatibility and reliability with your RC model. Genuine parts maintain warranty coverage and guarantee proper fit and performance that aftermarket alternatives cannot match.
- 12/47 Gear Ratio Design — The specific 12-tooth pinion to 47-tooth ring gear ratio is precisely calibrated to deliver optimal performance for the models it is designed for, balancing acceleration response with top speed capability for versatile driving performance.
- Rear Differential Assembly — This complete differential assembly includes both the ring gear and pinion gear in a single package, simplifying installation and ensuring both components are perfectly matched for smooth operation without binding or slippage.
- Drivetrain Upgrade Potential — Beyond replacement, many RC enthusiasts use differential gear ratio changes to tune their vehicle's performance characteristics, and this assembly provides an alternative gearing option for those looking to modify their RC car's acceleration and speed balance.
- Durable Construction — Built to withstand the demands of RC driving, whether bashing around the garden or competing on the track, this differential is engineered from quality materials to handle the stresses of power transmission.
- Easy Installation — As a bolt-on replacement part, the differential can be installed by anyone with basic RC mechanical knowledge and standard tools, making maintenance and upgrades straightforward for UK RC hobbyists.
Technical Performance
The Traxxas Ring Differential / Pinion Gear Differential represents precision engineering in the critical area of power transmission. The differential assembly is the mechanical component responsible for distributing engine or motor power to the rear wheels whilst allowing them to rotate at different speeds during cornering — a fundamental requirement for stable, predictable handling. The 12/47 gear ratio directly impacts your RC vehicle's performance envelope; the pinion gear teeth mesh with the ring gear teeth to transfer power whilst controlling the overall speed and acceleration characteristics. A 12-tooth pinion paired with a 47-tooth ring gear creates a specific reduction ratio that suits particular driving styles and track conditions. This ratio is ideal for drivers seeking a good balance between acceleration punch and top speed capability, making it versatile enough for both casual bashing and more spirited driving. The engineering tolerances are held to tight specifications to ensure smooth, quiet operation without the grinding or whining noises that can indicate poor-quality differentials. Whether you are replacing a worn differential after months of heavy use or are upgrading from a different ratio, this genuine Traxxas assembly delivers the reliability and performance consistency expected from an OEM component. Installation requires access to the differential housing and basic mechanical knowledge, but once fitted, the assembly provides thousands of hours of reliable service.
What's in the Box
- Ring Gear (47-tooth)
- Pinion Gear (12-tooth)
- Complete Differential Assembly
Frequently Asked Questions
- What does the 12/47 gear ratio mean and how does it affect my RC car's performance? — The 12/47 ratio refers to the 12-tooth pinion gear and 47-tooth ring gear. This creates a specific gear reduction that determines how power is transmitted to your wheels. A lower pinion tooth count relative to the ring gear (like 12/47) favours top speed and efficiency over raw acceleration. If you find your current vehicle feels sluggish off the line, a higher pinion count (like 14 or 16 teeth) would provide more acceleration; conversely, if you want maximum top speed on open areas, the 12-tooth pinion in this assembly is an excellent choice.
- Is this differential suitable for beginners? — This is a replacement component rather than a complete vehicle, so it is best suited to RC enthusiasts who already own a compatible Traxxas model and understand basic RC maintenance. Installing a differential requires removing the rear axle assembly and has several small components, so it is recommended for intermediate users or those willing to follow detailed instructions carefully. If you are new to RC and your vehicle comes with a differential already installed, you will not need to purchase this until replacement is necessary.
- How do I know if my Traxxas model uses the TRX6779 differential? — The Traxxas product code TRX6779 is specific to certain Traxxas models. You can verify compatibility by checking your vehicle's manual, contacting Traxxas customer support, or speaking with our team at RC Model Shop who can confirm whether this differential is correct for your particular model before you purchase.
- How often will I need to replace my differential? — With proper maintenance, a differential can last for hundreds of hours of driving. However, factors like extreme temperatures, high-speed racing, water submersion and continuous hard driving will wear it faster. Signs of wear include grinding noises, loss of traction or visible damage to the gears. Most casual RC enthusiasts replace differentials after 1-2 years of regular use, whilst racing competitors might change them more frequently.
- Can I upgrade from a different gear ratio to the 12/47? — Yes, if your vehicle currently has a different ratio installed, you can swap to the 12/47 for different performance characteristics. However, ensure the differential housing is designed to accept interchangeable ratios — not all Traxxas models support multiple gear options. Our team can advise whether your specific model allows ratio changes.
- What tools do I need to install this differential? — You will typically need a screwdriver set, hex keys (Allen keys) in various sizes, possibly a small wrench or socket set, and a clean workspace. Some models may require a differential puller tool if the existing unit is stuck. Always consult your vehicle's manual for the specific tools required and installation procedures for your model.
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 Ring Differential / Pinion Gear Differential (12 / 47 ratio) (Rear) TRX6779 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: TRX6779
- EAN: 0020334677907
- Part Type: Rear Differential Ring and Pinion Gears
- Category: Drivetrain Spares
- Pinion Gear Teeth: 12
- Ring Gear Teeth: 47
- Gear Ratio: 12/47
- Position: Rear Differential Assembly
- Components Included: Ring gear, pinion gear, complete differential assembly
- OEM Status: Genuine Traxxas Original Equipment Manufacturer component
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.
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- 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.
