FZCS63508T

Overview

The FONZON 35/8T Full Metal Split Front/Rear Differential is a precision-engineered upgrade component designed for serious RC enthusiasts running ARRMA 6S platform vehicles. Whether you're bashing hard with an RC Kraton 6S, Outcast 6S, or Typhon 6S, this differential delivers the rugged performance and reliability you need to tackle extreme terrain and maintain consistent power transfer to all wheels. Built for both weekend bashers and competitive racers, the FONZON differential combines full metal construction with factory assembly and testing, meaning it arrives ready to drop straight into your RC car and perform.

If you've been searching for a high-quality differential upgrade for your 1/10 brushless RC vehicle, the FONZON 35/8T represents a significant step up in durability and performance. The 4.38 gear ratio is specifically engineered for extreme acceleration and torque delivery, making it the ideal choice for heavy-duty off-road driving, explosive launch scenarios, stunt-focused builds, and big-foot RC vehicles like the ARRMA OUTCAST 6S. Unlike standard differentials that can wear quickly under demanding conditions, this unit withstands harsh terrain and constant high-torque demands whilst maintaining the smooth operation your RC build requires. Available here at RC Model Shop, a trusted UK RC retailer, this component represents a proven upgrade path for anyone looking to toughen up their ARRMA 6S platform vehicle.

The FONZON differential stands apart from budget alternatives through its commitment to premium materials and meticulous engineering. Every gear is CNC-machined from nickel-chromium alloy steel (4340 specification), ensuring exceptional strength and durability even when pushing your RC car to its limits. The metal diff case housing is constructed from 7075-T6 aluminium alloy, delivering optimal strength-to-weight ratio so you don't compromise on handling or acceleration. Pre-filled with 100K cSt differential oil and fully assembled at the factory, this is a complete solution that requires no additional setup or maintenance before installation.

Key Features

• Full Metal Construction — All gears are CNC-machined from premium nickel-chromium alloy steel (4340 specification) rather than plastic or lower-grade materials, delivering exceptional strength and durability that withstands extreme torque and harsh off-road conditions without premature wear.
• 7075-T6 Aluminium Alloy Diff Case — The centre housing is manufactured from aerospace-grade 7075-T6 aluminium alloy with a polished finish, providing optimal strength-to-weight ratio that keeps your RC car responsive whilst maintaining structural integrity under heavy loads.
• Extended Drive Cups for Reduced Misalignment — The +1.5mm extended nickel-chromium alloy steel drive cups actively reduce drivetrain misalignment under load, meaning smoother power delivery, longer component life, and more consistent handling across all terrain types.
• Grade 12.9 Titanium-Coated Fasteners — High-strength Grade 12.9 gold-coloured screws with titanium coating provide superior corrosion resistance and reliability, crucial for UK-based RC enthusiasts dealing with wet weather and muddy terrain.
• High-Quality Sealed Adapter Cup Bearings — Precision-sealed bearings ensure smooth and efficient operation under all conditions, preventing debris ingress and extending the operational life of your differential.
• Pre-Filled with Premium Differential Oil — Factory pre-filled with 100K cSt differential oil, providing correct viscosity for optimal performance and smooth gear engagement without requiring separate servicing before use.
• Factory-Assembled and Tested — Fully assembled and quality-tested at the factory, arriving ready to install directly into your ARRMA 6S vehicle with no additional setup, tuning, or maintenance required.
• Extreme 4.38 Gear Ratio — The 35/8T ratio delivers extreme acceleration and torque suitable for heavy-duty off-road driving, explosive launch scenarios, stunt builds, and big-foot RC vehicles, making it ideal for bashers seeking maximum power delivery.

Technical Performance

The FONZON 35/8T differential represents a significant engineering achievement in RC differential design, combining materials science excellence with precision manufacturing. The 35/8T gear ratio (4.38:1) is specifically calibrated for maximum acceleration and torque delivery, making it the premier choice for ARRMA 6S platform vehicles including the Kraton 6S, Outcast 6S, Notorious 6S, Talion 6S, Mojave 6S, Infraction 6S, Felony 6S, Fireteam 6S, and Typhon 6S. Every gear is CNC-machined from premium nickel-chromium alloy steel to 4340 specification, ensuring hardness and durability that standard plastic components simply cannot match. The diff case housing utilises aerospace-grade 7075-T6 aluminium alloy, the same material found in high-performance applications across the aviation and motorsport industries, delivering exceptional strength-to-weight characteristics. The extended +1.5mm nickel-chromium alloy steel drive cups work in conjunction with the sealed adapter cup bearings to minimise backlash and drivetrain misalignment under load, translating to noticeably smoother power transfer and more responsive handling. Pre-filled with 100K cSt differential oil calibrated for optimal viscosity, the differential maintains smooth engagement across all operating conditions. All fasteners are Grade 12.9 with titanium coating for superior corrosion resistance, essential for UK enthusiasts battling mud, salt, and damp conditions. Factory assembly and testing means your differential arrives in perfect working order, requiring only installation into your RC chassis.

What's in the Box

• FONZON 35/8T Full Metal Split Front/Rear Differential unit (fully assembled)
• Pre-filled with 100K cSt differential oil

Frequently Asked Questions

• Is the FONZON 35/8T differential suitable for my ARRMA 6S RC car? — Yes, the FONZON 35/8T is a direct fit for all ARRMA 6S platform models. This includes the Kraton 6S, Outcast 6S, Notorious 6S, Talion 6S, Mojave 6S, Infraction 6S, Felony 6S, Fireteam 6S, and Typhon 6S. Simply remove your existing differential and install this complete assembly.
• What does the 35/8T ratio actually mean and why is 4.38 important? — The 35/8T designation refers to the gear tooth count ratio: 35 teeth on the ring gear divided by 8 teeth on the pinion gear equals 4.38:1. This extreme ratio delivers maximum acceleration and torque rather than top speed, making it ideal for heavy-duty off-road driving, explosive launches, and stunt-focused builds.
• Why choose the FONZON differential over cheaper alternatives? — The FONZON uses full metal construction with CNC-machined nickel-chromium alloy steel gears (4340 specification) rather than plastic, aerospace-grade 7075-T6 aluminium alloy housing, extended drive cups that reduce misalignment, titanium-coated Grade 12.9 fasteners, and sealed bearings. These materials and engineering choices dramatically extend component life and reliability under the extreme conditions that ARRMA 6S vehicles encounter.
• Is this differential waterproof for UK wet conditions? — The differential features sealed adapter cup bearings that prevent debris ingress and provide protection against wet conditions. The titanium-coated fasteners offer superior corrosion resistance compared to standard stainless fasteners, making this unit well-suited for UK weather and muddy terrain.
• Does it require any setup or maintenance before installation? — No, the FONZON differential arrives fully factory-assembled and pre-filled with 100K cSt differential oil. Simply remove your existing differential and install this unit directly into your ARRMA 6S chassis. No additional servicing or tuning is required before use.
• What happens if I need to service or rebuild this differential? — The full metal construction and sealed bearings mean this differential is designed for long-term reliability and minimal maintenance. If eventual service is required, the CNC-machined metal gears and quality construction allow for professional rebuilding, whereas plastic gears cannot be recovered once damaged.
• How does the extended +1.5mm drive cup benefit my RC car? — The extended drive cups reduce drivetrain misalignment under load, particularly important when your ARRMA 6S encounters rough terrain or high-torque situations. This translates to smoother power delivery, reduced noise, longer component lifespan, and more predictable handling characteristics.

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 35/8T FULL METAL SPLIT FR/RR DIFF - ARRMA 6S SERIES FZCS63508T 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.