FZCS64312T

Overview

The FONZON 43/12T Full Metal Split Front/Rear Differential is a precision-engineered upgrade component designed for high-performance RC car enthusiasts in the UK who demand reliability and consistent power delivery. Built specifically for the ARRMA 6S platform, this differential represents a significant performance enhancement over standard components, making it an essential upgrade for bashers, racers, and serious hobbyists alike. Whether you're pushing your RC vehicle to its limits on the track or taking on extreme terrain, this split differential system is engineered to handle the punishment that modern brushless 6S LiPo-powered vehicles deliver.

The 43/12T gear ratio configuration provides a 3.58:1 mid-range gear ratio, perfectly balancing top speed with usable torque across varied driving conditions. This makes it an ideal choice for RC enthusiasts who want to fine-tune their vehicle's performance without compromising either acceleration or top-end speed. Whether you're running a Kraton 6S, Outcast 6S, Notorious 6S, or any other compatible ARRMA 6S model, this differential drops in as a direct replacement and transforms your drivetrain's responsiveness and reliability. Factory-assembled and pre-filled with professional-grade differential oil, the FONZON 43/12T arrives ready to install, saving you valuable time in the workshop.

For UK RC car enthusiasts seeking performance parts that deliver genuine improvements, the FONZON brand has earned recognition for uncompromising engineering quality and durability. This front/rear differential combines advanced metallurgy with precision manufacturing to create a component that can withstand extreme torque loads and harsh terrain without wearing prematurely. The full metal construction throughout ensures that whether you're running on loose off-road terrain, hard-packed surfaces, or rocky crawling grounds, your power delivery remains consistent and predictable.

Key Features

• All-metal gear construction — Every single gear is CNC-machined from nickel-chromium alloy steel (grade 4340), which is a premium material specifically chosen for its exceptional strength and wear resistance, ensuring your differential can handle sustained high-torque demands without stripping or fracturing under load.
• 7075-T6 aluminium alloy diff case — The centre housing is fabricated from aerospace-grade 7075-T6 aluminium alloy, offering the optimal strength-to-weight ratio that keeps your vehicle nimble whilst providing the rigidity needed to withstand extreme torque, with a polished finish that resists corrosion and looks professional.
• Extended nickel-chromium drive cups — The drive cups feature a +1.5mm extension in nickel-chromium alloy steel, which dramatically reduces drivetrain misalignment issues under heavy acceleration and cornering loads, translating directly to smoother power delivery and reduced wear on connected components.
• Premium Grade 12.9 titanium-coated screws — Every fastener is finished in gold-coloured, corrosion-resistant coating with titanium treatment, preventing bolt failure from vibration and environmental exposure whilst maintaining a professional appearance that reflects the quality of the entire assembly.
• High-quality sealed adapter cup bearings — Precision ball bearings with sealed design ensure smooth, efficient operation whilst keeping out dirt and debris, maintaining responsiveness and reducing friction losses that would otherwise rob you of performance and battery efficiency.
• Pre-filled with 100K cSt differential oil — The differential arrives pre-filled with professional-grade 100,000 centistoke differential oil, which is the ideal viscosity for 6S applications, providing proper gear lubrication and heat dissipation so you can get straight to driving without additional setup.
• Fully factory-assembled — This is not a kit requiring assembly; the entire differential is assembled and tested at the factory, arriving as a complete bolt-in component that eliminates assembly time and guarantees proper calibration and functionality out of the box.
• 43/12T split gearing system — The split front and rear gear configuration with 43T and 12T specifications creates a 3.58:1 gear ratio that balances acceleration, top speed, and overall drivability across most UK terrain and driving styles, from tight technical courses to open bashing environments.

Technical Performance

This FONZON differential represents the pinnacle of drivetrain engineering for the ARRMA 6S platform. The 43/12T configuration delivers a 3.58:1 gear ratio specifically designed to extract maximum performance from modern brushless motor systems without sacrificing control or reliability. The all-metal construction throughout—from the nickel-chromium alloy steel gears (4340 grade material) to the aerospace-grade 7075-T6 aluminium alloy diff case—ensures exceptional strength-to-weight characteristics that modern high-torque applications demand. The extended +1.5mm nickel-chromium alloy steel drive cups reduce misalignment issues that commonly occur under the extreme torque loads of 6S LiPo systems, maintaining precise power transfer even during hard acceleration and aggressive cornering. Professional-grade sealed ball bearings provide frictionless operation whilst keeping contaminants out, whilst the pre-filled 100K cSt differential oil ensures immediate performance without additional workshop preparation. Grade 12.9 titanium-coated fasteners prevent vibration-induced loosening and corrosion failure, addressing a common weak point in lesser-quality differentials. This assembly is factory-tested and calibrated to exacting standards, guaranteeing that it performs identically to the engineering specifications every time you use it. For UK RC car enthusiasts running high-performance brushless 6S setups, this differential bridges the gap between recreational bashing and competition-level performance, providing the reliability needed for consistent lap times or reliability-demanding off-road adventures.

What's in the Box

• FONZON 43/12T Full Metal Split Front/Rear Differential assembly (fully assembled and factory-tested)
• Pre-filled with 100K cSt differential oil
• Ready to install directly into ARRMA 6S platform vehicles

Compatibility

• ARRMA Kraton 6S (all versions)
• ARRMA Outcast 6S (all versions)
• ARRMA Notorious 6S (all versions)
• ARRMA Talion 6S
• ARRMA Mojave 6S
• ARRMA Infraction 6S
• ARRMA Felony 6S
• ARRMA Fireteam 6S
• ARRMA Typhon 6S (all versions)
• All other ARRMA 6S platform models

Frequently Asked Questions

• Is the FONZON 43/12T suitable for 6S brushless RC vehicles? — Yes, this differential is specifically engineered for ARRMA 6S platform vehicles powered by modern brushless motor systems and 6S LiPo batteries. The 43/12T gear ratio and full-metal construction are optimised to handle the high torque outputs that brushless 6S setups deliver, making it ideal for both recreational bashers and competitive racers.
• What makes the 43/12T gear ratio better than other options? — The 43/12T configuration provides a 3.58:1 gear ratio that represents a middle ground between pure speed and pure acceleration. This mid-range ratio balances top speed with usable torque across varied driving conditions, making it the most versatile option for UK drivers who want flexibility without having to change differentials for different tracks or terrain types.
• Do I need to fill this differential with oil, or does it come pre-filled? — The FONZON 43/12T arrives completely pre-filled with professional-grade 100K cSt differential oil, which is the correct viscosity for 6S applications. You can install it immediately without any additional oil preparation, saving workshop time and ensuring proper lubrication from your first drive.
• Is this a split differential or a centre differential? — This is a split front/rear differential system, meaning it features separate gearing specifically tuned for front and rear axle characteristics. Unlike centre differentials that use identical gearing front and rear, split systems allow for independent optimisation of handling balance and power delivery, which is why many high-performance builds prefer them.
• Will this differential fit my ARRMA vehicle directly? — Yes, this differential is engineered as a direct fit for all ARRMA 6S platform models including Kraton 6S, Outcast 6S, Notorious 6S, Talion 6S, Mojave 6S, Infraction 6S, Felony 6S, Fireteam 6S, and Typhon 6S. It requires no modifications or additional parts—simply remove your original differential and install the FONZON assembly.
• What is the advantage of the full-metal construction? — Full-metal construction using nickel-chromium alloy steel gears and 7075-T6 aluminium alloy housing provides superior strength and durability compared to plastic or hybrid construction. This means the differential resists stripping, fracturing, and premature wear even under extreme torque loads, extending service life and maintaining consistent performance over hundreds of hours of driving.
• Can I use different gear ratios with this differential? — While the FONZON brand offers other gear ratio options (such as 43/10T and 43/13T), each is a complete pre-assembled unit. The 43/12T provides the mid-range 3.58:1 ratio; if you need different performance characteristics, you would need to purchase an alternative gear ratio configuration from the FONZON range.
• How does the +1.5mm extended drive cup design improve performance? — The extended drive cups reduce misalignment between the differential and the axle shafts under load, which is critical in high-torque 6S applications. Less misalignment means more efficient power transfer, reduced friction losses, and lower stress on connected drivetrain components, resulting in better efficiency and longer component lifespan.

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 43/12T FULL METAL SPLIT FR/RR DIFF - ARRMA 6S SERIES FZCS64312T 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.