Traxxas 13/37 Rear Planetary Differential Ring and Pinion Gears TRX10879

Overview

The Traxxas 13/37 Rear Planetary Differential Ring and Pinion Gears (TRX10879) are essential replacement drivetrain components designed for RC enthusiasts who demand precision engineering and reliable performance from their Traxxas models. Whether you're a dedicated RC car UK hobbyist, a competitive racer, or someone who simply loves the thrill of high-performance RC vehicles, understanding your drivetrain components is crucial to maintaining optimal performance and longevity. These replacement gears are specifically engineered to fit the rear planetary differential system found in select Traxxas models, making them an indispensable spare part for anyone serious about maintaining their RC investment.

The 13-tooth pinion gear and 37-tooth ring gear combination represents a carefully calculated gear ratio that has been proven in countless RC racing scenarios across the UK and beyond. Traxxas has built its reputation on delivering components that perform consistently under demanding conditions, and these planetary differential gears are no exception. Whether you're replacing worn gears due to intensive use, experimenting with different gear ratios to tune your RC car's performance, or simply maintaining a spare set for race day, the TRX10879 delivers the quality and precision you'd expect from one of the world's leading RC manufacturers.

This product is specifically compatible with a range of popular Traxxas ready to run RC vehicles, including the Mini Rally VXL Ford RS200 and the Mini Slash BL-2S 4X4 short course truck models. If you're looking to restore your RC car to factory performance standards or optimise your drivetrain for specific racing conditions, these genuine Traxxas replacement gears are exactly what you need.

Key Features

• 13-Tooth Pinion Gear — The pinion gear is the smaller component in the gear mesh that directly connects to your motor, and the 13-tooth configuration provides a specific power-to-speed ratio that Traxxas engineers have optimised for the rear differential application, ensuring smooth power delivery and efficient energy transfer from motor to wheels.
• 37-Tooth Ring Gear — The ring gear is the larger component that meshes with the pinion, and this 37-tooth design works in concert with the 13-tooth pinion to create a precisely calculated gear ratio that defines how your RC car's power is distributed and how torque is multiplied through the drivetrain system.
• Rear Planetary Differential Application — These gears are specifically engineered for rear planetary differential systems, which provide superior traction control and handling characteristics compared to traditional open differentials, making them ideal for both track racing and off-road bashers seeking advanced drivetrain performance.
• Genuine Traxxas Manufacturing — As official Traxxas replacement parts, these gears are manufactured to exact OEM specifications using high-quality materials and precision machining processes that ensure perfect fitment and reliable performance in your RC vehicle.
• Critical Compatibility Note — It's important to understand that the pinion gear in this set does not work with the optional Traxxas centre differential or optional slipper clutch components, so careful consideration of your drivetrain configuration is essential before installation to avoid compatibility issues.
• Replacement Spare Part — Classified as a drivetrain spare part, these gears are designed as direct replacements for worn or damaged originals, allowing you to restore your RC car's performance to factory specifications or to experiment with different setups to optimise handling and speed characteristics.

Technical Performance

The Traxxas 13/37 rear planetary differential gears represent the intersection of precision engineering and real-world RC performance demands. Planetary differential systems are more complex than traditional open differentials, offering superior traction management by allowing controlled slipping of the differential gears under load, which translates to improved cornering grip, reduced understeer, and better overall handling dynamics on both track and terrain. The specific 13-tooth pinion to 37-tooth ring gear ratio (approximately 2.85:1) is a carefully engineered compromise that provides adequate torque multiplication for acceleration whilst maintaining reasonable top-speed capability. These gears are manufactured from hardened steel alloys using precision machining techniques, ensuring they can withstand the intense forces generated during hard acceleration, cornering, and braking cycles. The machining tolerances are extremely tight, ensuring that mesh contact between the pinion and ring gear is perfect, which minimises noise, reduces power loss through friction, and extends component lifespan. For RC car enthusiasts in the UK pushing their vehicles to the limits on race tracks or in competitive off-road scenarios, this level of precision engineering is non-negotiable—it's the difference between a vehicle that performs consistently and one that develops play and slop in the drivetrain over time. Whether you're running a ready to run RC model straight out of the box or a highly tuned competition vehicle, these gears provide the foundation for reliable, predictable drivetrain performance that you can trust.

What's in the Box

• 13-tooth pinion gear
• 37-tooth ring gear for rear planetary differential

Frequently Asked Questions

• Which Traxxas RC models are these gears compatible with? — The TRX10879 gears are specifically designed for the Traxxas Mini Rally VXL Ford RS200 (available in red, blue, and grey colour options) and the Traxxas Mini Slash BL-2S 4X4 RTR short course truck (available in pink, green, yellow, and orange). If you're unsure whether your particular RC vehicle uses these gears, check your model's documentation or contact us for confirmation before ordering.
• What's the difference between these gears and other gear ratios available? — The 13/37 tooth configuration creates a specific gear ratio that balances acceleration with top-end speed. Other available gear ratios (such as different tooth counts) will shift this balance either towards quicker acceleration with lower maximum speed, or higher top speed with reduced acceleration. The 13/37 combination is factory-engineered for the rear differential application in these models.
• Do these gears work with the optional centre differential or slipper clutch? — No, and this is a critical compatibility point: the pinion gear in this set is not compatible with Traxxas's optional centre differential or optional slipper clutch components. You must verify your drivetrain configuration before purchasing to avoid installation issues. If you're planning to upgrade to these optional components, you'll need different gears.
• Why would I need to replace these gears? — Over time, planetary differential gears experience wear from the intense forces of acceleration, cornering, and braking. Worn gears develop rough edges and gaps in mesh contact, which reduces performance, increases noise, and can eventually lead to gear failure. Replacement becomes necessary either when gears show signs of wear or when you want to experiment with different gear ratios to optimise your RC car's performance characteristics for specific racing conditions or driving styles.
• Are these gears suitable for high-speed racing? — These gears are engineered for the rear planetary differential system in their compatible Traxxas models and are designed to withstand competitive racing conditions. The hardened steel construction and precision manufacturing ensure reliability under demanding use, making them suitable for serious racers and bashers alike who demand consistent, predictable drivetrain performance.

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 13/37 Rear Planetary Differential Ring & Pinion Gears TRX10879 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.