Overview
The Traxxas Gear Set for the Rear Differential (TRX8577) is an essential replacement and upgrade component designed specifically for the Traxxas UDR Unlimited Desert Racer Pro-Scale 4WD short course truck. Whether you're maintaining your RC car UK setup after intense weekend bashing or looking to optimise your differential performance, this genuine Traxxas differential gear set delivers the quality and reliability you expect from the world's leading RC manufacturer. This is a precision-engineered drivetrain component that directly impacts your vehicle's acceleration, handling and overall performance on challenging terrain.
The Unlimited Desert Racer is renowned amongst serious RC enthusiasts in the UK and worldwide for its authentic pro-scale design and genuine off-road capability. The rear differential is a critical component in the drivetrain system, responsible for distributing power to the rear wheels whilst allowing them to rotate at different speeds during cornering. A high-quality differential gear set ensures smooth, efficient power delivery and can significantly enhance your RC truck's performance characteristics, making it an important upgrade for any UDR owner seeking to maintain or improve their vehicle's condition.
If you're running a ready to run RC truck and want to keep it performing at its peak, or if you're building a custom setup, this rear differential gear set from Traxxas offers genuine OEM components manufactured to exact specifications. It's the smart choice for RC hobbyists who demand reliability and authenticity in every component of their machine.
Key Features
- Complete Output Gear Set — Includes two precision-manufactured output gears that transfer power from the differential housing to the rear axles, ensuring smooth and efficient power distribution to your rear wheels during acceleration and cornering.
- Spider Gear Assembly — Features four spider gears that work in conjunction with the output gears to allow speed differentiation between the left and right rear wheels, which is essential for smooth turning and balanced handling through corners.
- Genuine Traxxas OEM Components — These are authentic factory-original parts manufactured to Traxxas' exact specifications, guaranteeing perfect fitment and reliable long-term performance with your UDR Unlimited Desert Racer.
- Direct Replacement Design — These gears are engineered as drop-in replacements for worn or damaged differential components, making maintenance and repairs straightforward for RC enthusiasts of all experience levels.
- Precision Engineering — Manufactured using Traxxas' proven engineering standards, these gears ensure consistent power delivery and minimal drivetrain loss, translating to improved acceleration and efficiency.
- Compatible with UDR Models — Designed specifically for the Traxxas UDR Unlimited Desert Racer Pro-Scale 4WD RTR Short Course Truck with Fox Racing or Rigid Industries variants, guaranteeing perfect compatibility.
Technical Performance
The Traxxas TRX8577 rear differential gear set represents the pinnacle of precision drivetrain engineering for the 1/7 scale UDR platform. The output gears and spider gears work in perfect harmony to manage the complex demands of four-wheel-drive off-road performance, distributing engine torque efficiently to both rear wheels whilst accommodating the speed variations necessary for tight cornering. These gears are manufactured from high-strength materials selected specifically for their durability and resistance to the intense stresses generated during aggressive acceleration, high-speed cornering and challenging terrain navigation. The precision tooth profile on both the output gears and spider gears ensures minimal backlash and maximum efficiency, reducing drivetrain friction and allowing more of your vehicle's available power to be translated into forward motion. For RC car UK owners pushing their vehicles hard on natural terrain, in competitive racing, or during weekend bashers, maintaining differential gear health is crucial for consistent performance. The tight tolerances and quality control standards applied during manufacturing mean these gears will withstand thousands of hours of demanding use, though periodic inspection and replacement after heavy use is recommended to maintain optimal performance characteristics. When paired with the TRX8581 differential case (required separately), this gear set creates a complete, fully functional rear differential assembly capable of handling the demands of professional-grade RC short course truck operation.
What's in the Box
- Output gears (2 pieces)
- Spider gears (4 pieces)
What You Need to Complete
- TRX8581 Differential case (required to build complete differential assembly)
Frequently Asked Questions
- Is the Traxxas TRX8577 rear differential gear set suitable for beginners? — This is a replacement component rather than a complete beginner-focused product. However, if you already own a Traxxas UDR Unlimited Desert Racer and need to maintain or repair your differential, this is a straightforward replacement. Most RC enthusiasts with basic mechanical knowledge can install these gears, particularly if they have experience working on ready to run RC trucks. If you're new to differential maintenance, watching installation guides or visiting an RC specialist shop in the UK can help ensure proper assembly.
- Which Traxxas UDR models are compatible with this gear set? — The TRX8577 is specifically designed for the Traxxas UDR Unlimited Desert Racer Pro-Scale 4WD RTR Short Course Truck. It fits both the Fox Racing variant (TRX85086-4-FOX1) and the Rigid Industries variant (TRX85086-4-RGD1), making it a versatile replacement option for any UDR owner.
- Do I need anything else to complete the differential? — Yes, you'll need the TRX8581 differential case to build a complete, functional differential assembly. The TRX8577 gear set provides only the internal gears, so purchasing the case separately is essential for a full installation.
- How often should I replace these differential gears? — This depends heavily on your usage patterns. If you regularly bash your RC truck on rough terrain, use it in competitive racing, or drive it intensively, inspection every 10-15 hours of use is recommended. Signs of wear include rough rotation, grinding noises, or visible tooth damage. For casual weekend users, these gears may last considerably longer. Always check your gears regularly and replace them if you notice any signs of excessive wear.
- What's the difference between this differential gear set and aftermarket alternatives? — The TRX8577 is a genuine Traxxas OEM component manufactured to factory specifications with guaranteed fitment and durability. Whilst some aftermarket alternatives may offer cost savings, they may not provide the same precision engineering, material quality, or long-term reliability. For the serious RC enthusiast in the UK who demands peak performance from their short course truck, genuine Traxxas components ensure consistent results and proper differential function.
- Can these gears be upgraded or customised? — The TRX8577 represents Traxxas' engineered solution for the UDR differential. Whilst some aftermarket gear sets exist with different ratios or materials, for stock UDR operation, these genuine gears deliver optimal performance. If you're exploring customisation, consult with experienced RC specialists to understand how gear changes might affect your truck's handling characteristics.
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 Gear Set, Rear Differential (output gears (2 pcs) / spider gears (4 pcs)) (#8581 required to build complete Differential) TRX8577 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: TRX8577
- Product type: Rear differential gear set
- Contents: Output gears (2 pieces), Spider gears (4 pieces)
- Compatible vehicles: Traxxas UDR Unlimited Desert Racer Pro-Scale 4WD RTR Short Course Truck Fox Racing (TRX85086-4-FOX1)
- Compatible vehicles: Traxxas UDR Unlimited Desert Racer Pro-Scale 4WD RTR Short Course Truck Rigid Industries (TRX85086-4-RGD1)
- Additional components required: TRX8581 differential case (required to build complete differential)
- EAN: 0020334857705
- Classification: Tune-up transmission component
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