Traxxas Ring Differential / Pinion Gear Differential (Front) TRX5379R

Overview

The Traxxas Ring Differential / Pinion Gear Differential (Front) TRX5379R is a premium upgrade component designed for serious RC enthusiasts running high-performance brushless RC cars and trucks across the UK. This machined spiral-cut differential gear set represents a significant step up from standard straight-cut alternatives, offering superior performance characteristics that make it the ideal choice for anyone looking to maximise their RC vehicle's potential. Whether you're pushing your 1/10 scale brushless RC short course truck, monster truck, or rally car to its limits, this front differential upgrade delivers the precision engineering and performance gains that competitive RC drivers demand.

Built by Traxxas, a name synonymous with quality and reliability in the RC hobby, this differential gear set is engineered for high-torque, high-speed brushless applications. The spiral-cut design represents the pinnacle of differential technology for RC vehicles, offering a blend of durability, smooth operation, and traction that simply cannot be matched by older straight-cut gear designs. If you're serious about getting the best performance from your ready to run RC truck or car, upgrading to the TRX5379R front differential is one of the most impactful modifications you can make.

This is not a complete differential assembly – it's a gear set designed to replace the factory gears in your existing front differential carrier. The TRX5379R fits a wide range of Traxxas 4WD models, from the legendary Slash 4X4 and Stampede 4X4 to the modern Ford Fiesta ST Rally and Ford F-150 Raptor R 4X4, making it an accessible upgrade for many UK RC hobbyists already invested in the Traxxas ecosystem.

Key Features

• Spiral-cut gear teeth design — Unlike conventional straight-cut gears, the teeth on this differential set are cut with a precise curve that dramatically reduces backlash between the ring and pinion gears. This means less play, smoother power delivery, and more responsive handling characteristics, which translates directly to better control and predictability when pushing your brushless RC vehicle hard.
• CNC-machined steel construction — Each gear in this set is cut from a solid block of steel using precision CNC machinery, ensuring absolute consistency and dimensional accuracy. This manufacturing process guarantees that every tooth is cut to exact specifications, creating a perfectly balanced gear set that runs smoother and lasts longer than inferior alternatives.
• Maximised tooth surface area — The spiral-cut profile creates a larger contact area between the ring and pinion gears compared to straight-cut designs. This increased surface area means better load distribution, more efficient power transfer from your brushless motor, and reduced wear on individual teeth, extending the lifespan of your differential gearing.
• High-torque and high-speed capability — This gear set is specifically engineered for the demands of modern brushless RC vehicles, which deliver significantly more power than brushed alternatives. The robust construction and superior design allow these gears to handle the punishment of high-torque brushless motors without stripping or premature failure.
• 37-tooth ring and 13-tooth pinion configuration — This specific gear ratio provides an excellent balance between acceleration and top speed for most competitive RC applications. The ratio is well-suited to a wide variety of driving conditions, from tight technical courses to open bashing terrain.
• Front differential compatibility — This is specifically engineered as a front differential upgrade, meaning you get optimised performance characteristics for the front axle of your 4WD RC truck or car, with all the benefits that come from having matched, high-quality gearing throughout your drivetrain.

Technical Performance

The Traxxas TRX5379R represents the latest evolution in RC differential technology. The spiral-cut gear teeth are cut with a precise mathematical curve that creates a rolling contact pattern between the ring gear (37 teeth) and pinion gear (13 teeth) that is fundamentally superior to the straight-cut designs found on entry-level and mid-range RC vehicles. This design philosophy, borrowed from full-size automotive engineering, ensures that power flows from your brushless motor through the differential with minimal loss and maximum efficiency. The gears are CNC-machined from solid steel blocks, a manufacturing process that guarantees dimensional precision and consistency across every unit produced. This attention to detail means that every spiral-cut gear set performs identically, eliminating the variability that can occur with less rigorous manufacturing processes. The increased tooth surface area created by the spiral-cut profile distributes mechanical stress more evenly across the entire tooth face, meaning each individual tooth carries less load and therefore experiences less wear over time. For brushless RC applications, where motor power output is typically 50-100% higher than brushed motors of the same size, this robust construction is absolutely essential. The machined steel construction also provides superior dimensional stability, meaning your differential will maintain its tight tolerances and smooth operation even after hours of intense driving. Whether you're running a high-powered Slash 4X4 Brushless, Stampede 4X4 VXL, or any of the other compatible Traxxas 4WD models, the TRX5379R front differential delivers the performance characteristics that serious RC drivers expect from genuine Traxxas components.

What's in the Box

• 37-tooth spiral-cut ring gear (CNC-machined steel)
• 13-tooth spiral-cut pinion gear (CNC-machined steel)

Compatible RC Models

The TRX5379R front differential gear set is engineered to fit the following Traxxas 4WD models:

• Ford Fiesta ST Rally (all variants including VXL and Brushless)
• Ford F-150 Raptor R 4X4 (1/10 Pro Scale Brushless)
• Hoss 4X4 VXL
• Revo
• Rustler 4X4 (all variants including Brushless, Ultimate, VXL, and Ultimate VXL)
• Slash 4X4 (all variants including Ultimate, VXL, Brushless, and Ultimate VXL)
• Slayer Pro 4X4
• Stampede 4X4 (all variants including Brushless, VXL, and HD VXL)
• Summit
• T-Maxx
• XO-1

What You Need to Complete

• Existing Traxxas 4WD model with compatible front differential carrier
• Basic tools including hex keys and differential service tools (typically included with Traxxas vehicles)
• Traxxas-approved differential fluid for reassembly

Installation and Maintenance

Installing the TRX5379R front differential gears requires access to your vehicle's front differential carrier and basic mechanical knowledge. This is not a plug-and-play component – you will need to disassemble your existing front differential, remove the old gears, and install the new spiral-cut gears in their place. Most Traxxas users find this process straightforward, particularly if they have previous experience maintaining their RC vehicles. If you are new to differential work, we recommend consulting the official Traxxas assembly documentation or seeking guidance from experienced RC enthusiasts. Once installed, these gears will deliver immediate benefits in terms of smoother operation, reduced backlash, and improved overall drivability. Regular maintenance involves periodic inspection for wear and ensuring adequate differential fluid is present – follow your vehicle's documentation for specific service intervals and fluid recommendations.

Frequently Asked Questions

• What is the difference between spiral-cut and straight-cut differential gears? — Spiral-cut gears feature teeth cut with a mathematical curve rather than straight across. This curve creates a larger contact area between gears, which distributes forces more evenly and reduces backlash (play between gears). The result is smoother, quieter operation, better power transfer efficiency, and longer gear lifespan. Spiral-cut gears are the professional-grade choice for competitive RC drivers and high-performance brushless applications.
• Will the TRX5379R fit my Traxxas RC vehicle? — The TRX5379R is designed as a front differential upgrade for most Traxxas 4WD models, including the Slash 4X4, Stampede 4X4, Rustler 4X4, and many others listed in the compatibility section above. However, not all Traxxas models are compatible – it is specifically engineered for the front differential, so it will not fit in the rear. Check your vehicle's model name against the compatibility list to confirm fitment before ordering.
• Is this suitable for beginners? — While the TRX5379R is an excellent component, installation requires disassembling your vehicle's front differential and replacing the gears – this is an intermediate-level maintenance task rather than something a complete beginner would typically attempt. However, if you have basic mechanical skills and access to your vehicle's documentation, or if you have an experienced RC friend who can guide you, installation is absolutely achievable. For absolute beginners, we recommend starting with simpler upgrades and gaining experience before tackling differential work.
• What is the gear ratio of this differential? — The TRX5379R uses a 37-tooth ring gear and 13-tooth pinion gear, creating a 37:13 ratio. This balanced configuration provides excellent mid-range performance across a variety of driving conditions and terrain types, making it suitable for both competitive racing and recreational bashing with brushless RC vehicles.
• Will upgrading to the TRX5379R make a noticeable difference? — Yes, upgrading to spiral-cut gears typically results in immediately noticeable improvements in handling smoothness, reduced mechanical noise, and more responsive steering inputs. The reduced backlash means your vehicle responds more precisely to throttle and steering commands, which many drivers find creates a more connected, rewarding driving experience.
• Can I use the TRX5379R in the rear differential as well? — No, the TRX5379R is specifically engineered as a front differential gear set. Traxxas produces separate rear differential gear sets for vehicles that require them. Using a front set in the rear position or vice versa will result in poor fitment and performance issues.
• What motor and ESC do I need for this differential? — The TRX5379R is designed to work with any brushless RC system, as it is a passive mechanical component that does not interact with your motor or ESC. It will function identically whether your vehicle is equipped with a modest brushless motor or a high-performance racing setup. The advantage of the spiral-cut design is that it can handle the power output of even very powerful brushless motors without premature failure.
• How long will these gears last? — With proper maintenance and regular inspection, CNC-machined spiral-cut gears like the TRX5379R will outlast straight-cut alternatives by a significant margin. Durability depends on driving intensity, maintenance practices, and the power output of your brushless motor, but many users report hundreds of hours of reliable service from quality Traxxas 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) TRX5379R 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.