Overview
The FONZON Full Metal F/R Diff Universal is purpose-built for the ARRMA GROM series, delivering robust power transfer in a lightweight, mini-scale package. Whether you're upgrading your RC car UK setup or reinforcing your drivetrain for enhanced performance, this compact all-metal differential represents a significant step up in durability and precision engineering. Designed with high-strength materials and precision assembly, it's the ultimate upgrade for anyone seeking smoother, more consistent drivetrain operation on their ARRMA GROM model.
If you're serious about RC car performance and longevity, this FONZON differential is engineered specifically for the demands of mini-scale RC bashers and enthusiasts. The combination of premium materials—including 7075-T6 aluminium alloy and nickel-chromium steel—ensures that your ARRMA GROM series vehicle (whether a Granite GROM, Typhon GROM, Mojave GROM, or Quake GROM) will benefit from improved power delivery and extended component lifespan. This is a ready-to-install upgrade that comes fully assembled and pre-filled with differential oil, making it one of the most straightforward performance enhancements you can add to your RC car setup.
Compact size doesn't mean compromising on durability. This differential is engineered to handle the stresses of aggressive driving, high-RPM operation, and demanding terrain. Whether you're tuning for competitive performance or simply reinforcing your drivetrain against wear and tear, the FONZON Full Metal Differential for ARRMA GROM is ready for the challenge and will give you confidence in every drive.
Key Features
- Powder Metallurgy Planetary Gears — These gears deliver excellent strength and precision in a compact form factor, ensuring reliable power distribution without adding unnecessary bulk to your mini-scale RC vehicle. The powder metallurgy process creates gears with superior consistency compared to traditional casting methods.
- 7075-T6 Aluminium Alloy Centre Housing — The diff case is machined from aerospace-grade 7075-T6 aluminium alloy, which is renowned for its exceptional strength-to-weight ratio and rigidity. This lightweight construction maintains the handling characteristics of your ARRMA GROM whilst providing the durability needed for demanding RC car UK driving conditions.
- Nickel-Chromium Alloy Steel Drive Cups — These drive cups are specifically engineered for durability under high RPM conditions, resisting wear and fatigue that can develop during extended driving sessions. The nickel-chromium alloy provides superior corrosion resistance and maintains its integrity even under extreme operating temperatures.
- Powder Metallurgy Drive Bevel and Ring Gears — The precision-engineered bevel and ring gears ensure consistent torque transfer throughout the drivetrain, providing smooth acceleration and reliable power distribution across all driving scenarios. This precision engineering minimises noise and vibration compared to lesser-quality differentials.
- Grade 12.9 Black Corrosion-Resistant Screws — All fasteners are Grade 12.9 rated for maximum strength and durability, finished with black corrosion-resistant coating to protect against rust and degradation. These premium screws ensure your differential remains securely assembled even after extended use and exposure to moisture.
- Factory Pre-Filled with 3K cSt Differential Oil — This unit arrives pre-filled with premium 3K cSt differential oil, which is specifically selected for optimal performance in mini-scale differentials. The correct viscosity ensures smooth gear engagement and proper power distribution without being so thick as to create drag or so thin as to fail under load.
- Fully Assembled and Ready to Install — Unlike some aftermarket differentials that require assembly, the FONZON arrives completely assembled and ready for straightforward installation into your ARRMA GROM. This saves time and eliminates the potential for assembly errors, getting you back on the track or trail faster.
Technical Performance
The FONZON Full Metal F/R Differential represents a significant engineering upgrade for ARRMA GROM series models. Built around a centre housing machined from 7075-T6 aluminium alloy, this differential combines lightweight construction with exceptional rigidity and strength. The use of powder metallurgy for the planetary gears, bevel gear, and ring gear ensures dimensional accuracy and consistency that you simply won't find in stamped or cast alternatives. The nickel-chromium alloy steel drive cups are engineered to withstand the mechanical stresses of high-RPM operation, whilst the Grade 12.9 corrosion-resistant screws secure everything with industrial-grade reliability. Pre-filled with 3K cSt differential oil, this unit delivers optimal performance straight out of the box. The precision engineering of all internal components ensures smooth, consistent power transfer, reducing drivetrain noise and vibration whilst improving overall responsiveness. Whether you're running casual weekend bashes or more intensive driving sessions, this differential provides the durability and performance characteristics needed for reliable operation across a wide range of driving conditions and terrain types. The compact form factor ensures compatibility with the tight tolerances of mini-scale platforms like the ARRMA GROM range, whilst the premium material selection guarantees longevity and reliability that will outlast lesser-quality alternatives.
What's in the Box
- FONZON Full Metal Front/Rear Differential (fully assembled)
- Factory pre-filled with 3K cSt differential oil
Frequently Asked Questions
- Is the FONZON Full Metal Differential compatible with all ARRMA GROM models? — Yes, this differential is specifically designed for the ARRMA GROM series, including the Granite GROM, Typhon GROM, Mojave GROM, and Quake GROM. It functions as a universal front or rear differential upgrade for these models.
- What makes this differential better than the standard ARRMA GROM differential? — The FONZON features a machined 7075-T6 aluminium alloy centre housing compared to plastic alternatives, plus nickel-chromium alloy steel drive cups and powder metallurgy gears for superior strength and precision. These premium materials ensure better durability, smoother power delivery, and longer component lifespan, making it an ideal upgrade for anyone seeking enhanced performance and reliability from their RC car UK setup.
- Does this differential come ready to install? — Absolutely. The FONZON arrives fully assembled and pre-filled with 3K cSt differential oil, requiring no additional setup or calibration. You can install it directly into your ARRMA GROM without any assembly work.
- What is the benefit of powder metallurgy gears? — Powder metallurgy manufacturing produces gears with superior consistency, dimensional accuracy, and strength compared to traditional casting or stamping methods. This translates to more reliable power transfer, reduced backlash, quieter operation, and longer component life—all critical factors in demanding RC car applications.
- Will this differential improve my ARRMA GROM's acceleration and handling? — By providing more precise power transfer and reducing drivetrain slop, this differential will enhance acceleration response and overall handling consistency. The improved durability also means less performance degradation over time, maintaining that responsive feel throughout extended driving sessions.
- Is this suitable for beginners? — Yes, this is an excellent upgrade for beginners who want to protect their investment in an ARRMA GROM. The straightforward installation and immediate performance benefits make it a sensible upgrade even if you're new to RC car UK customisation.
- How often will I need to service this differential? — The factory pre-filled 3K cSt oil is designed for reliable long-term operation. However, after extensive use in dusty or wet conditions, you may wish to drain and refresh the oil to maintain optimal performance and longevity.
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 FULL METAL F/R DIFF UNIVERSAL - ARRMA GROM SERIES FZCSGRR03 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.
- Brand: Method RC / FONZON
- Model Number: FZCSGRR03
- Barcode: 195286010826
- Product Type: Full Metal Differential (Front/Rear Universal)
- Application: ARRMA GROM series (Granite GROM, Typhon GROM, Mojave GROM, Quake GROM)
- Centre Housing Material: 7075-T6 Aluminium Alloy (machined)
- Gear Type: Powder Metallurgy Planetary Gears
- Drive Cups: Nickel-Chromium Alloy Steel
- Bevel Gear: Powder Metallurgy
- Ring Gear: Powder Metallurgy
- Fasteners: Grade 12.9 Black Corrosion-Resistant Screws
- Pre-Filled Oil: 3K cSt Differential Oil
- Assembly Status: Fully Assembled and Ready to Install
- Warranty/Support: Available from RC Model Shop
We want to make sure your delivery goes smoothly, so here are some important details about our service:
- For orders above £120, we offer delivery to most mainland UK addresses. For orders under £120, we can still deliver to Northern Ireland and the outlying isles, as long as the item can be sent by Royal Mail, weighs less than 30kg, and fits within 61cm × 46cm × 46cm. Some highland and remote areas may carry an extra delivery charge as couriers often apply surcharges in these locations. If you live in one of these areas, feel free to contact us before ordering so we can confirm the delivery options and costs for you.
- Most of our products include delivery in the price. If your order is under £90, a small delivery fee will apply but do not worry this will always be clearly shown at checkout before you complete your purchase.
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- For customers in Inverness and other parts of the Scottish Highlands deliveries can take up to 2 working days even if you select next day delivery as couriers do not currently offer a guaranteed next day service to those areas.
