FZCS64313T

Overview

The FONZON 43/13T Full Metal Split Front/Rear Differential is a precision-engineered upgrade component designed specifically for ARRMA 6S platform RC vehicles. Built for high-performance RC demands, this differential is engineered to withstand extreme torque and harsh terrain, delivering consistent power transfer and drivetrain reliability that serious bashers and racers depend on. Whether you're pushing your TYPHON to its limits on the track or taking your Kraton 6S over rough terrain, this differential provides the rugged performance and smooth operation your ARRMA 6S build demands. The 43/13T gear ratio represents a 3.31A high-speed setup, specifically optimised to improve RPM efficiency and wheel speed response, making it the perfect choice for lightweight, high-speed models that need rapid acceleration and responsive handling.

This is not a basic differential—it's a fully assembled, factory-tested component ready to drop straight into your RC car and perform right out of the box. FONZON has engineered every aspect of this differential with precision, from the CNC-machined gears to the aerospace-grade aluminium housing, ensuring that your drivetrain can handle the punishment of serious RC driving. If you're shopping for RC differentials in the UK or looking to upgrade your ARRMA 6S RC car, this is a component that will deliver noticeable improvements in performance, reliability and longevity.

RC car enthusiasts know that the differential is one of the most critical components in any drivetrain. A quality differential like the FONZON 43/13T ensures that power is distributed efficiently to both wheels, reduces understeer and oversteer, and maintains consistent traction across varied terrain. This split differential design allows independent adjustment and tuning of front and rear differential behaviour, giving you the precision control that competitive RC racers and serious hobbyists expect.

Key Features

• All CNC-Machined Gears in Nickel-Chromium Alloy Steel — Every gear is precision-machined from grade 4340 nickel-chromium alloy steel, a material chosen specifically for its exceptional strength, durability and resistance to the extreme stresses experienced in high-performance RC driving. This ensures your differential will survive repeated bashing, racing impacts and high-torque demands without stripping or degrading.
• 7075-T6 Aluminium Alloy Metal Diff Case — The centre housing is manufactured from aerospace-grade 7075-T6 aluminium alloy, offering an optimal strength-to-weight ratio that keeps your RC car light whilst maintaining the structural integrity needed to contain high-torque forces. The polished finish not only looks premium but also demonstrates the quality engineering throughout.
• Extended Nickel-Chromium Alloy Steel Drive Cups — The +1.5mm extended drive cups are crafted from the same tough nickel-chromium alloy steel as the gears, and they work to reduce drivetrain misalignment under load, a critical factor in maintaining smooth power delivery and preventing binding or jerking during aggressive driving.
• Grade 12.9 Gold-Coloured Titanium-Coated Screws — All fasteners are Grade 12.9 bolts with gold-coloured, corrosion-resistant coatings and titanium treatment, ensuring they won't rust, strip or loosen even in wet conditions or after repeated use. These premium screws contribute significantly to the overall durability and reliability of the assembly.
• High-Quality Sealed Adapter Cup Bearings — The sealed bearings ensure smooth and efficient operation whilst protecting internal components from dirt, mud and moisture. This sealed design extends the life of the differential and maintains consistent performance even in challenging off-road conditions.
• Pre-Filled with 100K cSt Differential Oil — The differential arrives pre-filled with high-quality 100K cSt differential oil, which provides optimal lubrication for the gears and bearings, reducing friction and heat generation during high-speed running. This eliminates the guesswork of differential fluid selection and gets you running immediately.
• Fully Factory-Assembled and Ready to Install — Every FONZON differential is completely assembled and tested at the factory, meaning you receive a fully functional component that's ready to drop straight into your ARRMA 6S without requiring any additional assembly, adjustment or testing before use.
• 43/13T High-Speed Gear Ratio (3.31A) — This specific gear ratio is engineered for high-speed performance, optimising RPM efficiency and wheel speed response. It's particularly well-suited to lightweight, high-speed models where maximising top speed and acceleration is the priority.
• Direct Fit for ARRMA 6S Platform — This differential is precision-engineered to fit seamlessly into any ARRMA 6S model, including the Kraton 6S, Outcast 6S, Notorious 6S, Talion 6S, Mojave 6S, Infraction 6S, Felony 6S, Fireteam 6S and Typhon 6S, ensuring perfect compatibility and fitment without modification.

Technical Performance

The FONZON 43/13T differential represents the pinnacle of RC drivetrain engineering, combining premium materials with meticulous manufacturing processes to create a component that performs at the highest level. The use of nickel-chromium alloy steel (grade 4340) for all gearing ensures that these components can withstand the extreme stresses inherent in high-performance RC driving, from repeated high-torque acceleration to sudden braking forces and impact loads from rough terrain. The 7075-T6 aluminium alloy housing strikes the perfect balance between strength and weight—critical for maintaining the overall performance characteristics of your ARRMA 6S. The +1.5mm extended drive cups are a detail that demonstrates FONZON's engineering sophistication; by extending the drive cup length, they minimise the chances of misalignment under load, which translates to smoother power delivery, more predictable handling, and reduced wear on the drivetrain components. The sealed adapter cup bearings ensure that regardless of whether you're driving through water, mud or dust, the internal mechanisms remain protected and continue to operate smoothly. The 43/13T ratio (3.31A) is specifically chosen for models prioritising speed and acceleration; this is a high-speed setup that optimises wheel RPM and response time, making it ideal for circuit racing or high-speed bashing where every millisecond of acceleration counts. The pre-filled 100K cSt differential oil provides professional-grade lubrication right out of the box, eliminating variables and ensuring optimal performance from day one. This is a component engineered and manufactured to the standards expected by serious RC enthusiasts in the UK and globally.

What's in the Box

• FONZON 43/13T Full Metal Split Front/Rear Differential assembly, fully assembled and factory-tested
• Pre-filled with 100K cSt differential oil
• Ready to install directly into compatible ARRMA 6S models

Compatibility

This differential is engineered as a direct fit for the following ARRMA 6S platform models:

• ARRMA Kraton 6S
• ARRMA Outcast 6S
• ARRMA Notorious 6S
• ARRMA Talion 6S
• ARRMA Mojave 6S
• ARRMA Infraction 6S
• ARRMA Felony 6S
• ARRMA Fireteam 6S
• ARRMA Typhon 6S

Frequently Asked Questions

• What makes the FONZON 43/13T differential better than standard OEM differentials? — The FONZON 43/13T features all CNC-machined gears in premium nickel-chromium alloy steel, a polished 7075-T6 aluminium alloy housing, extended drive cups to reduce misalignment, and sealed bearings with pre-filled differential oil. These features combine to offer superior durability, smoother operation and more reliable performance than standard differentials, particularly under the extreme stresses of competitive racing or aggressive bashing.
• Will this differential fit my ARRMA 6S? — Yes, provided your model is part of the ARRMA 6S platform series. This includes the Kraton 6S, Outcast 6S, Notorious 6S, Talion 6S, Mojave 6S, Infraction 6S, Felony 6S, Fireteam 6S and Typhon 6S. If you have a different ARRMA model (such as a 5S or 3S variant), this differential will not fit—always verify your model before purchasing.
• What does the 43/13T ratio mean, and is it right for my driving style? — The 43/13T ratio creates a 3.31A gear ratio, which is a high-speed setup optimised for RPM efficiency and rapid wheel speed response. This ratio is ideal if you prioritise acceleration and top speed, making it perfect for lightweight, high-speed models and competitive racing. If you predominantly bash slower, heavier terrain or prefer lower gearing for more torque, you may want to explore alternative ratios, but for speed-focused driving, this is an excellent choice.
• Is the differential pre-filled with oil, or do I need to add oil before use? — The FONZON 43/13T arrives completely pre-filled with premium 100K cSt differential oil, ready to install and use immediately. You do not need to add oil before installation—simply drop it in and you're ready to run.
• What is the difference between a split differential and a standard differential? — A split differential allows independent tuning and adjustment of the front and rear differential behaviour, giving you greater control over how your RC car handles in different conditions. This precision is especially valuable in competitive racing, where fine-tuning drivetrain behaviour can make the difference between winning and losing.
• Can I upgrade from my standard differential to this FONZON unit? — Absolutely. If your current ARRMA 6S uses a standard OEM differential, upgrading to the FONZON 43/13T will deliver noticeable improvements in durability, smoothness and performance reliability. The factory-assembled design means installation is straightforward—simply remove the old differential and install the new one according to your model's manual.
• How durable is this differential in wet or muddy conditions? — The sealed adapter cup bearings protect the internal components from dirt and moisture, and all fasteners feature corrosion-resistant gold-coloured titanium coatings, making this differential highly resistant to degradation in wet, muddy or salt-water conditions. The nickel-chromium steel gears are also naturally corrosion-resistant, ensuring long-term durability even with exposure to harsh environments.

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 FONZON 43/13T Full Metal Split Front/Rear Differential for ARRMA 6S 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.