Overview
The Traxxas Ring Differential / Pinion Gear Differential (Front) TRX8578 is an essential drivetrain component for Traxxas RC enthusiasts in the UK who demand reliable performance and precise handling from their vehicles. This genuine Traxxas spare part is specifically engineered to deliver smooth, predictable differential action on the front axle of compatible Traxxas models, making it an ideal upgrade or replacement for anyone looking to maintain their ready to run RC truck in peak condition. Whether you're a weekend basher enjoying your RC car UK adventure or a serious hobbyist pushing your vehicle to its limits, this differential gear set ensures your machine performs consistently lap after lap.
Differential gears are crucial components in any RC car or RC buggy, as they allow the front wheels to rotate at different speeds during cornering while maintaining traction and stability. The TRX8578 front differential is designed with precision-engineered ring and pinion gears that work together to deliver optimal torque distribution and smooth power delivery. This component is particularly valuable for owners of the Traxxas UDR (Unlimited Desert Racer) Pro-Scale 4WD models, including the Fox Racing and Rigid Industries variants, as it directly impacts steering response, cornering speed and overall handling characteristics. If you've noticed any grinding noises, inconsistent turning behaviour, or wear on your current differential, replacing it with this genuine Traxxas part will restore your RC truck's performance to factory specifications.
As an authorised Traxxas dealer serving RC enthusiasts across the UK, RC Model Shop stocks only genuine original equipment parts manufactured to exacting standards. This differential gear set represents genuine Traxxas engineering, ensuring compatibility, durability and the peace of mind that comes from knowing your RC vehicle is equipped with the correct spare part.
Key Features
- Genuine Traxxas Manufacturing — This is an authentic OEM (original equipment manufacturer) part built by Traxxas to the exact same standards and tolerances as the differential included in new vehicles, guaranteeing perfect compatibility and reliable performance with no fitment issues.
- Front Differential Application — Specifically designed for front axle installation, this component works in conjunction with your vehicle's front suspension and steering systems to provide responsive, predictable handling characteristics that serious RC drivers depend on.
- Precision-Engineered Gears — The ring and pinion gears are manufactured using advanced processes to ensure smooth meshing, minimal backlash and quiet operation, which translates to better handling feel and reduced drivetrain noise during high-speed runs.
- Direct Replacement Part — If your existing differential has become worn, damaged or is grinding, this TRX8578 unit is a drop-in replacement that requires no modification or additional components, making installation straightforward for any RC enthusiast.
- Improved Cornering Performance — A well-functioning differential allows the outside wheels to turn faster than the inside wheels during corners, which is essential for maintaining traction and preventing tyre scrubbing that would slow down your RC buggy or RC truck.
- Essential Maintenance Component — Regular inspection and replacement of wear items like differential gears ensures your RC vehicle continues to perform reliably and helps prevent secondary damage to other drivetrain components.
Technical Performance
The Traxxas Ring Differential / Pinion Gear Differential (Front) TRX8578 is engineered from durable materials designed to withstand the stresses and impacts of RC off-road driving. The gear set comprises carefully matched ring and pinion gears that work together in a 37-tooth to 13-tooth ratio configuration, providing the optimal balance between low-end torque and mid-range acceleration for desert racing applications. This gear ratio, combined with the precision manufacturing tolerances Traxxas applies to all drivetrain components, ensures that rotational forces are transmitted smoothly from the motor through the transmission to the front wheels without excessive backlash or binding. The materials used in the construction of these gears are selected specifically for durability and longevity, allowing them to withstand repeated acceleration, braking and cornering forces typical of RC short course truck racing and bashing. When properly installed and maintained, this differential operates virtually silently and contributes to the overall responsiveness and predictability that drivers experience through the steering wheel. The design philosophy behind this component emphasises reliability under demanding conditions, whether you're navigating rough terrain, executing high-speed desert runs, or enjoying casual backyard driving with your brushless RC car.
What's in the Box
- Traxxas Ring Gear and Pinion Gear Differential Assembly
- Front differential gears (37-tooth ring gear, 13-tooth pinion gear)
Frequently Asked Questions
- Which Traxxas models is the TRX8578 compatible with? — This front differential is designed for the Traxxas UDR (Unlimited Desert Racer) Pro-Scale 4WD RTR Short Course Truck, specifically the Fox Racing variant (TRX85086-4-FOX1) and the Rigid Industries variant (TRX85086-4-RGD1). If you own one of these models, this is the correct replacement part.
- Do I need to replace both front and rear differentials at the same time? — Not necessarily. The front and rear differentials operate independently, so you can replace just the front differential if that is the component showing wear. However, if both are worn, replacing both will restore full original performance characteristics.
- How difficult is it to install this differential? — Installation requires basic RC mechanical knowledge and the appropriate tools to remove the existing differential from the front axle and install this replacement. Most experienced RC hobbyists can complete installation in 30-60 minutes, though beginners may benefit from consulting an assembly guide or asking experienced RC enthusiasts for guidance.
- How often do differentials need replacing in an RC vehicle? — The lifespan of a differential depends on driving frequency, terrain, driving style and maintenance. Regular bashers might need replacement every 1-2 years, while occasional drivers may get several years of service. Grinding sounds or notchy handling indicate it's time for replacement.
- What is the gear ratio of this differential? — This differential features a 37-tooth ring gear paired with a 13-tooth pinion gear, providing a specific torque and acceleration balance optimised for the Traxxas UDR platform.
- Can this differential be upgraded with aftermarket gears? — Many RC enthusiasts upgrade to steel or titanium gears for increased durability, or to alternative gear ratios for different performance characteristics. However, the TRX8578 in its standard form uses Traxxas' OEM specification gears.
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 (Front) TRX8578 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: TRX8578
- EAN: 020334857804
- Part Type: Drivetrain Spares
- Component Type: Ring Gear and Pinion Gear Differential Assembly
- Application: Front Differential
- Ring Gear Teeth: 37-tooth
- Pinion Gear Teeth: 13-tooth
- Gear Ratio: 37:13
- Compatible Vehicles: Traxxas UDR Unlimited Desert Racer Pro-Scale 4WD RTR Short Course Truck (Fox Racing variant TRX85086-4-FOX1 and Rigid Industries variant TRX85086-4-RGD1)
- Genuine OEM Traxxas Part: Yes
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.
