Overview
The Fastrax Arrma Grom/Granite/Mojave Aluminium Diff Housing in striking blue is an essential upgrade component for owners of these popular small-scale RC vehicles. Whether you're running an Arrma 1/18 Granite Grom, 1/16 Mojave Grom, or any of the compatible models, this precision-engineered differential housing delivers superior durability and performance compared to standard plastic alternatives. As an RC enthusiast in the UK, you'll appreciate how this upgrade transforms the reliability of your differential system, reducing wear and extending the lifespan of your transmission components during intense bashings and competitive racing.
This aluminium differential housing is manufactured by Fastrax, a brand recognised for producing high-quality replacement parts and upgrades for popular RC platforms. The blue finish not only looks fantastic on your Grom or Granite, but the aluminium construction provides significantly improved heat dissipation and structural rigidity compared to plastic housings. If you're serious about maintaining your RC car in peak condition or want to prevent differential failures during aggressive driving, this is a must-have upgrade for your spares collection.
Perfect for intermediate and advanced RC car owners, this component represents the kind of tune-up that separates casual weekend bashers from dedicated enthusiasts who want their vehicles to perform reliably, session after session. The Fastrax Arrma Grom/Granite/Mojave Alum Diff Housing - Blue is ready to install and compatible with multiple Arrma models, making it a versatile upgrade option for anyone running these popular small-scale platforms.
Key Features
- Aluminium Construction — Unlike standard plastic differential housings, this component is manufactured from durable aluminium alloy, which provides superior structural strength and significantly better heat management during extended running sessions. This means your differential will run cooler and resist warping or cracking under stress.
- Premium Blue Finish — The striking blue anodised finish not only delivers exceptional visual appeal that coordinates perfectly with many Arrma colour schemes, but also provides a protective layer against corrosion and oxidation, ensuring your investment stays looking factory-fresh.
- Drop-In Compatibility — This housing is engineered as a direct replacement for the factory plastic differential housing on compatible Arrma models. Installation is straightforward for anyone with basic RC maintenance knowledge, requiring no modifications or special tools beyond standard hex wrenches.
- Enhanced Durability — The rigid aluminium design significantly reduces flex and deflection compared to plastic housings, which translates directly into more consistent differential performance and reduced wear on internal gears and bearings during high-torque driving situations.
- Improved Heat Dissipation — Aluminium's superior thermal conductivity means the housing naturally disperses heat away from internal components more effectively than plastic, helping to preserve internal lubrication viscosity and extending component lifespan during sustained high-performance driving.
Technical Performance
The Fastrax Arrma Grom/Granite/Mojave Aluminium Diff Housing represents a significant performance upgrade over standard plastic components. By switching to this aluminium alternative, you're investing in a component that addresses one of the common failure points in small-scale RC vehicles — the differential system. The aluminium construction provides substantially improved rigidity, reducing the micro-deflections that can accumulate wear on internal gearing over time. Whether you're running a brushed or brushless motor in your Grom or Granite, this housing maintains consistent performance by minimising differential flex under load. The enhanced heat dissipation properties of aluminium are particularly valuable during extended bashings or competitive racing sessions, where sustained high-torque operation can cause plastic housings to warp or lose their precise tolerances. The blue finish is applied through professional anodising, creating a durable protective layer that guards against the corrosion that can occur when your RC car encounters grass, dirt, and moisture typical of UK outdoor environments. This component works seamlessly with the original Arrma drivetrain design, maintaining factory gear ratios and engagement while simply upgrading the material science behind the housing itself.
What's in the Box
- Fastrax Arrma Grom/Granite/Mojave Aluminium Diff Housing (Blue)
Frequently Asked Questions
- Which Arrma models does this differential housing fit? — This Fastrax aluminium diff housing is compatible with multiple popular Arrma small-scale models, including the 1/18 Granite Grom Mega 380 (available in Blue/Red, Green, and Red colour options), the 1/16 Mojave Grom 223S BLX 4x4 (both the DT version with and without battery and charger included), and the Mojave Grom Mega 380 Brushed 4x4 (available in Red and Blue). Check your specific model number against the compatibility list to confirm fit before ordering.
- Why should I upgrade to an aluminium differential housing? — Plastic differential housings can flex and warp under the sustained stress of high-torque motor operation, which gradually wears internal gears and bearings. An aluminium upgrade like this provides rigid support that maintains precise internal tolerances, resulting in smoother operation, reduced wear, and improved longevity. Additionally, aluminium dissipates heat far more effectively than plastic, keeping your differential running cooler during extended driving sessions.
- Is this suitable for beginners or do I need advanced mechanical skills? — Whilst this is a performance upgrade component rather than a complete vehicle, installation requires only basic RC maintenance knowledge and standard hex wrenches. If you're comfortable removing and reinstalling your differential during routine maintenance, you have the skills needed to fit this housing. However, if you're brand new to RC and haven't worked on differential systems before, you may want to ask an experienced friend or visit your local RC hobby shop for guidance on the first installation.
- What is the difference between this aluminium housing and the standard plastic factory housing? — The factory plastic housing is adequate for casual bashing, but the plastic material flexes under load, which causes micro-movements that gradually wear internal gears and bearings. This Fastrax aluminium version is dramatically more rigid, maintains tighter tolerances, dissipates heat more efficiently, and resists warping. The net result is noticeably improved differential performance and significantly extended component lifespan, particularly if you drive aggressively or compete.
- Will this improve my RC car's speed or acceleration? — This component is not designed to increase top speed or acceleration. Instead, it improves the mechanical efficiency and longevity of your differential system by maintaining precise gear engagement and reducing parasitic losses caused by housing flex. The real benefit is reliability and durability rather than raw performance gains.
- How do I install this differential housing on my Arrma Grom or Granite? — Installation involves removing the factory plastic housing and replacing it with this aluminium version. The process is similar to standard differential maintenance and requires removing the diff cover, carefully extracting the housing, and installing the new aluminium component with your existing internal gears and bearings. Consult your Arrma vehicle manual for detailed step-by-step instructions, or visit YouTube for visual guides specific to your model.
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 FASTRAX ARRMA GROM/GRANITE/MOJAVE ALUM DIFF HOUSING - BLUE FTAR068B 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: Fastrax
- Product Code: FTAR068B
- EAN: 5056135785232
- Component Type: Differential Housing
- Material: Aluminium Alloy
- Colour: Blue (Anodised)
- Tune-Up Type: Transmission
- Compatible With: Arrma 1/18 Granite Grom Mega 380 Brushed 4x4 Monster Truck RTR (Blue/Red), Arrma 1/18 Granite Grom Mega 380 Brushed 4x4 Monster Truck RTR (Green), Arrma 1/18 Granite Grom Mega 380 Brushed 4x4 Monster Truck RTR (Red), Arrma 1/16 Mojave Grom 223S BLX 4x4 DT with Batt/Charger (White), Arrma 1/16 Mojave Grom 223S BLX 4x4 DT with Batt/Charger (Teal), Arrma 1/16 Mojave Grom 223S BLX 4x4 DT (Black), Arrma Mojave Grom Mega 380 Brushed 4x4 Small Scale Desert Truck RTR (Red), Arrma 1/16 Mojave Grom 4x4 RTA Race Kit with Battery and Charger, Arrma Mojave Grom Mega 380 Brushed 4x4 Small Scale Desert Truck RTR (Blue)
- Installation: Direct Replacement Component
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- 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.
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