Traxxas Differential Gear Kit 38-Tooth Drive Gear 20-Tooth Spare TRX5579

Overview

The Traxxas Gears Differential 38-T (TRX5579) is an essential drivetrain spare part designed for RC enthusiasts in the UK who demand reliability and performance from their Traxxas vehicles. Whether you're a weekend basher, a competitive racer, or someone who enjoys regular RC car UK adventures, maintaining your differential gears is crucial to keeping your model running smoothly. This genuine Traxxas differential gear kit provides everything you need to service, repair, or upgrade your RC car's drivetrain, ensuring optimal power delivery and handling characteristics.

Traxxas has built its reputation on quality engineering and precision manufacturing, and this differential gear assembly is no exception. The TRX5579 kit includes the critical 38-tooth differential gear alongside supporting components that work together to distribute engine power evenly to both wheels, allowing your RC model to corner efficiently whilst maintaining traction. Whether you're upgrading worn parts or fine-tuning your setup for competition, this genuine Traxxas spare part is the correct choice for maintaining factory-specification performance in ready to run RC vehicles and custom builds alike.

As an authorised Traxxas retailer, RC Model Shop stocks this genuine part to help you keep your RC car performing at its best. The differential is one of the most important components in your RC car's transmission system, and having quality replacement parts on hand means less downtime and more track time. This comprehensive kit has been engineered to exacting Traxxas standards and is the genuine factory component you can trust.

Key Features

• 38-Tooth Differential Gear — The primary gear in this kit is specifically engineered to manage torque distribution between the left and right wheels, allowing smooth cornering and maintaining traction during acceleration; this tooth count is critical for matching your RC car's performance envelope and drivetrain characteristics.
• 20-Tooth Differential Drive Gear — This complementary gear works in conjunction with the 38-tooth gear to provide the correct gear ratio; it drives the differential carrier and is essential for proper power transmission throughout the drivetrain system.
• Side Cover Plate — A precision-engineered aluminium or composite cover plate that protects the internal differential mechanism whilst allowing smooth operation; this component is essential for containing differential fluid and preventing dirt ingress into critical drivetrain components.
• Gasket Seal — A high-quality gasket ensures a watertight seal between the differential housing and side cover, preventing drivetrain fluid leakage and protecting internal components from moisture and contamination; this is particularly important for RC cars used in varied UK weather conditions.
• Output Gear Seals (X-Ring) — Two precision x-ring seals are included to seal the output shafts where they exit the differential housing; these seals prevent fluid loss and keep contaminants out, extending the lifespan of your differential and maintaining performance consistency.
• Hardware Kit — The kit includes four 2.5x8mm CCS fasteners and two 5x10x0.5mm TW washers, providing all the hardware necessary for proper assembly and ensuring that every component is secured with the correct specification fasteners.
• Genuine Traxxas Quality — As an original equipment manufacturer part, this differential kit meets Traxxas' exacting quality standards and is manufactured to precise tolerances; using genuine parts ensures compatibility and reliability with your Traxxas RC car.
• Complete Service Kit — Rather than purchasing individual components, this kit provides everything needed for a full differential service or replacement, saving time and ensuring you have all necessary parts in one purchase.

Technical Performance

This differential gear kit has been engineered using Traxxas' extensive experience in high-performance RC vehicle development. The 38-tooth gear is precisely machined to exacting tolerances, ensuring smooth mesh with the 20-tooth drive gear and delivering consistent power distribution without noise, vibration, or efficiency loss. The materials used in this kit—including the hardened steel gears and precision-engineered seals—have been selected to withstand the demands of both recreational RC car UK use and competitive racing environments. The side cover plate is designed to integrate seamlessly with your existing Traxxas differential housing, and the gasket and x-ring seals use elastomer compounds specifically formulated to resist the effects of differential fluid, temperature extremes, and the mechanical stresses inherent in RC car operation. The included fasteners are grade-specified to ensure proper clamping force without overtightening or stripping, which is critical when assembling precision drivetrain components. Whether you're replacing worn differential gears, upgrading for higher performance, or performing routine maintenance on your brushless RC car, this kit provides the factory-standard components that Traxxas vehicles are designed to use. The precision of these components directly impacts your vehicle's handling characteristics, cornering stability, and overall driving experience, making this a worthwhile investment for anyone serious about RC car performance in the UK.

What's in the Box

• 1x Traxxas Gears Differential 38-T
• 1x Differential drive gear 20-T
• 1x Side cover plate
• 1x Gasket
• 2x Output gear seals (x-ring)
• 4x 2.5x8mm CCS fasteners
• 2x 5x10x0.5mm TW washers

Frequently Asked Questions

• What is a differential gear and why do I need to replace it? — The differential is a critical component in your RC car's drivetrain that distributes power to both wheels whilst allowing them to rotate at different speeds during cornering. Over time, differential gears can wear, strip, or break due to heavy use, impacts, or aggressive driving. Replacing worn differential gears is essential for maintaining proper handling, traction, and overall vehicle performance. If you notice grinding noises from your drivetrain, poor cornering performance, or power loss, your differential gears may need replacement.
• Is this kit suitable for my Traxxas RC car? — The TRX5579 is a genuine Traxxas component designed for specific Traxxas models. To ensure compatibility with your particular RC vehicle, we recommend checking your vehicle's manual or contacting our RC Model Shop team for confirmation. Using genuine Traxxas parts ensures perfect fit and optimal performance, so it's worth verifying compatibility before purchase.
• How difficult is it to install a differential gear kit? — Installing a differential gear kit requires moderate mechanical skill and patience. You'll need to remove the differential housing from your RC car, disassemble the existing differential, clean internal components, install the new gears, apply the correct differential fluid, and reassemble everything using the provided gasket and seals. If you're comfortable working with precision mechanical components and have the necessary tools, this is an achievable DIY task; however, if you're new to RC car maintenance, we recommend having an experienced RC enthusiast help you or taking your vehicle to a specialist RC repair centre. The gasket and seals are particularly important—they must be installed correctly to prevent fluid leaks.
• What differential fluid should I use with this kit? — Traxxas manufactures specific differential fluids in various viscosity ratings designed to work optimally with their differential components. The correct fluid choice depends on your driving style, temperature conditions, and desired handling characteristics. Thicker fluid provides more traction but can make the vehicle feel sluggish, whilst thinner fluid allows more speed but less traction. Consult your vehicle manual for the recommended fluid specification, and consider your local UK weather conditions when choosing viscosity.
• Can I use this kit for both on-road and off-road RC cars? — Differential gears are used in virtually all RC car types, including on-road racers, off-road buggies, monster trucks, and crawlers. However, the TRX5579 is specifically engineered for particular Traxxas models, so compatibility varies. Off-road and on-road vehicles may have different differential requirements based on their intended use and drivetrain design. Always verify that this kit is correct for your specific model before purchasing.
• How often should I service my differential? — Regular differential maintenance extends component lifespan and maintains performance. Many RC car enthusiasts service their differentials every 5-10 hours of use, or immediately if they notice grinding noises, fluid leaks, or performance changes. Heavy users or competitive racers may service more frequently. Inspect your differential housing regularly for signs of leakage around the seals or cover plate—these are early indicators that service is needed.
• Why is the gasket and seal quality important? — The gasket and x-ring seals are critical for keeping differential fluid where it belongs—inside the differential housing. If these seals fail, you'll experience fluid leaks that reduce lubrication and can lead to catastrophic gear failure. Additionally, leaking fluid can contaminate other drivetrain components and create a messy situation. Quality seals like those included in the TRX5579 ensure a long-lasting, reliable seal that withstands temperature changes and mechanical stress, providing peace of mind during extended RC driving sessions.

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 Gears, Differential 38-T (1pc) / Differential drive gear 20-T / side cover plate (1pc) / gasket (1pc) / output gear seals (x-ring) (2 pcs) / 2.5x8mmCCS (4 pcs) / 5x10x.5mmTW (2 pcs) TRX5579 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.