- Part Type: Differential Case Upgrade Kit (Transmission)
- Manufacturer: ARRMA
- Model Number: ARA220050
- EAN: 5052127034357
- Tune-Up Category: Transmission
- Diff Case Body Material: Anodised Aluminium (lightweight and durable)
- Diff Case Face Plate Material: Hardwearing Steel
- Included Components: 1 x Aluminium Diff Case Body, 1 x Steel Diff Case Face Plate, 2 x Diff Gaskets, 4 x Gear Shims, 8 x M3 x 8mm Button Head Screws
- Compatible with Centre Diff Set: AR220029 (50T)
- Compatible with Front/Rear Diff Set: AR220041 (43T Spiral) or AR220028 (43T Straight)
- Vehicle Compatibility: ARRMA 6S BLX Models
- Compatible Models: ARA7617V2 (1/7 Felony 6S AVC), ARA7618 (1/7 Fireteam 6S), ARA109001 (1/7 Infraction 6S), ARA7615V2 (1/7 Infraction 6S AVC), ARA7116V2 (1/7 Limitless 6S Roller), ARA109011 (1/7 Limitless 6S RTR), ARA106058 (1/7 Mojave 6S RTR), ARA7604V2 (1/7 Mojave 6S RTR), ARA106040 (1/8 Kraton 6S RTR), ARA8608V5 (1/8 Kraton 6S RTR), ARA106044 (1/8 Notorious 6S RTR), ARA8611V5 (1/8 Notorious 6S RTR), ARA106042 (1/8 Outcast 6S RTR), ARA106060 (1/8 Outcast 6S Limited Edition), ARA106048 (1/8 Talion 6S RTR), ARA106046 (1/8 Typhon 6S RTR), ARA8606V5 (1/8 Typhon 6S V5 RTR), ARA8306 (1/8 Typhon 6S TLR Tuned Roller), ARA8406 (1/8 Typhon 6S TLR Tuned RTR)
- Precision Manufacturing: Engineered for reliable fit and performance
- Durability Enhancement: Aluminium and steel construction for increased strength compared to plastic differentials
- Gasket Quality: Precision gaskets included for reliable sealing
- Shim Accuracy: Four gear shims for precise gear spacing and alignment
- Fastener Specification: M3 x 8mm button head screws for secure assembly
Overview
The ARRMA Metal Diff Case Z-ARA220050 is a professional-grade upgrade component designed specifically for RC enthusiasts who demand superior performance and durability from their brushless RC models. This Metal Diff Case set transforms plastic differentials into reinforced, high-strength assemblies that can withstand the rigours of intense off-road driving, whether you're running a 1/7 scale RC buggy, 1/8 RC speed truck, or any other ARRMA 6S BLX model in your collection. If you own a ready-to-run RC car or truck and have noticed differential wear or simply want to future-proof your investment with stronger components, this upgrade set delivers the engineering quality you'd expect from ARRMA's official parts range.
Manufactured using aerospace-grade aluminium and hardened steel, this differential case upgrade is a must-have for serious RC bashers, weekend racers, and competitive drivers across the UK who refuse to compromise on build quality. The precision engineering ensures that this part integrates seamlessly with your existing model, offering an immediate boost in durability without requiring frame modifications or complex rebuilds. Whether you're upgrading a plastic cased differential on your ARRMA Felony, Infraction, Kraton, Notorious, Outcast, Talion, Typhon, Mojave or Limitless, this metal diff case set provides the reinforcement needed for extended lifespan and reliable performance in challenging terrain.
This is not a complete differential assembly but rather a sophisticated upgrade kit containing all the components needed to transform a standard plastic differential into a durable metal version. The set includes precision-manufactured parts alongside gaskets, shims and fasteners, making it a comprehensive solution for any RC hobbyist looking to strengthen their transmission system. By choosing this ARRMA upgrade, you're investing in components that have been engineered by the brand's specialists and tested across a wide range of high-performance RC vehicles sold throughout the UK and beyond.
Key Features
- Anodised Aluminium Diff Case Body — The primary casing is crafted from lightweight yet exceptionally durable aluminium that has been anodised for enhanced corrosion resistance and longevity. This material choice ensures your differential remains protected against dirt, moisture and the wear that comes from intense RC driving while keeping overall weight minimal for better handling characteristics.
- Hardwearing Steel Diff Case Face Plate — The face plate is manufactured from tough steel that resists impact and wear better than plastic alternatives. Steel's superior strength means the face plate can endure repeated stress from gear engagement and shock loads without deformation, directly extending the service life of your entire differential assembly.
- Precision Engineered Construction — Every component in this set has been manufactured to exact tolerances, ensuring perfect fitment with your ARRMA model's transmission components. This precision manufacturing eliminates gaps and misalignments that could lead to premature wear or noise issues, delivering the smooth, reliable operation that competitive RC drivers and hobbyists demand.
- Complete Rebuild Kit Included — Unlike partial upgrade kits, this set includes everything necessary for a complete differential rebuild, including two high-quality gaskets for reliable sealing, four gear shims for precise gear spacing and alignment, and eight M3 x 8mm button head screws that provide secure assembly. This comprehensive approach means you won't need to source additional parts from multiple suppliers.
- Compatible with Multiple ARRMA Models — The metal diff case is specifically engineered to retrofit into ARRMA 6S BLX models, working seamlessly with centre diff set AR220029 (50T), front/rear diff set AR220041 (43T spiral) or front/rear diff set AR220028 (43T straight). This broad compatibility makes it an excellent choice whether you own a 1/7 scale buggy, 1/8 scale speed truck, or any other qualifying ARRMA brushless model.
- Increased Durability Over Standard Parts — By upgrading from plastic to metal construction, you're fundamentally improving the strength-to-weight ratio of your differential assembly. Metal components resist cracking, warping and permanent deformation far better than plastic, meaning your RC vehicle will maintain consistent performance session after session, even during high-stress racing or extreme bashing.
Technical Performance
The ARRMA Metal Diff Case represents a significant engineering upgrade in differential technology for 1/7 and 1/8 scale brushless RC vehicles. The aluminium diff case body provides the ideal balance between strength and weight efficiency—aluminium is approximately one-third the density of steel yet offers exceptional rigidity when properly engineered. The anodising process applied to the aluminium creates a hardened oxide layer that resists corrosion from moisture, salt and acidic soils commonly encountered during outdoor RC driving throughout the UK. The steel face plate complements this design perfectly, as steel's superior hardness ensures consistent contact surfaces that won't flatten or wear unevenly under the tremendous forces generated by high-powered brushless motors driving through the differential gears. When installed correctly with the included gaskets and shims, this assembly maintains precise gear spacing that is critical for smooth operation and maximum efficiency in power transfer from motor to wheels. The four gear shims allow fine-tuning of gear mesh patterns, enabling builders to achieve the optimal balance between minimal backlash and smooth engagement. This level of precision engineering is essential for models running brushless powerplants like those found in ARRMA 6S BLX models, where torque delivery is immediate and unforgiving to poorly assembled differentials. The included M3 x 8mm button head screws are specifically sized and rated for the stress loads these assemblies experience, ensuring vibration-resistant assembly that won't loosen during operation.
What's in the Box
- 1 x Aluminium Diff Case Body (anodised)
- 1 x Steel Diff Case Face Plate
- 2 x Diff Gaskets
- 4 x Gear Shims
- 8 x M3 x 8mm Button Head Screws
What You Need to Complete
- Compatible differential set: AR220029 (Centre Diff Set 50T), AR220041 (F/R Diff Set 43T Spiral), or AR220028 (F/R Diff Set 43T Straight)
- Tools for disassembly and reassembly of differential components
- Threadlocker compound (recommended for secure screw assembly)
Frequently Asked Questions
- Which ARRMA models is the Metal Diff Case compatible with? — This metal diff case is designed for ARRMA 6S BLX models and will retrofit with centre differential set AR220029 (50T) or front/rear differential sets AR220041 (43T spiral) and AR220028 (43T straight). Compatible vehicles include the 1/7 Felony, Infraction, Limitless and Mojave, as well as 1/8 models such as Kraton, Notorious, Outcast, Talion and Typhon. If you're unsure whether your specific model qualifies, check your vehicle documentation or contact your local RC retailer for confirmation.
- Will upgrading to a metal diff case improve my RC vehicle's performance? — Yes, upgrading to this metal diff case will enhance durability and extend the service life of your differential system significantly. You'll notice more consistent performance over extended driving sessions because metal components resist wear, deformation and cracking better than plastic. The improved gear mesh accuracy also means smoother power delivery and potentially more efficient energy transfer from your brushless motor to the wheels, which can translate to better handling and responsiveness.
- Is this suitable for beginners? — This is an intermediate-level upgrade component best suited for hobbyists with some experience in RC vehicle maintenance and assembly. Installing a metal diff case requires disassembling your existing differential, careful handling of small components and shims, and precise reassembly. If you're new to RC, we recommend becoming familiar with basic maintenance tasks before tackling a full differential rebuild. However, this is an excellent upgrade to consider once you've gained some mechanical confidence with your RC car.
- What tools will I need to install the metal diff case? — You'll need standard RC tools including hex wrenches (keys) to fit the M3 screws, a small screwdriver set for differential disassembly, and potentially a small pair of tweezers for handling the gaskets and shims. A workbench or clean, organised work surface is essential, as differential components are small and easily lost. Having threadlocker compound on hand is highly recommended to prevent screws from vibrating loose during intense driving sessions.
- Can I use this metal diff case with non-ARRMA differentials? — No, this kit is specifically engineered and tested for use with ARRMA differential assemblies. Attempting to use it with differentials from other manufacturers may result in poor fitment, performance issues or component damage. Always verify compatibility before purchasing by confirming your vehicle's differential part number against the ARRMA specifications.
- How does the anodised aluminium benefit my RC vehicle? — Anodising creates a hard, corrosion-resistant oxide layer on the aluminium surface that provides multiple benefits. It protects against rust and oxidation that can occur from exposure to moisture, salt and dirt—common during outdoor RC driving. The anodised finish also looks more professional and finished compared to raw aluminium, and the hardened surface resists scratching and wear from handling, maintenance and transport.
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 ARRMA Metal Diff Case Z-ARA220050 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.
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.
- Depending on what you choose at checkout, your order will usually be delivered either the next working day or within 2 working days. For next day delivery please place your order before 2:00pm. Orders are dispatched Monday to Friday only. Some items may take a little longer and if that is the case we will always show the expected delivery time on the product page.
- If your order includes items with different dispatch times we will normally wait and send everything together once all items are in stock. If one of the items is going to take a while we will give you the choice either wait for everything to arrive or let us send the available items now and deliver the rest later. It is up to you.
- We use trusted delivery partners to make sure your order gets to you safely and on time. We use DPD for next working day deliveries and Royal Mail for the 2 day option.
- As soon as your order is on its way we will send you a tracking number by email. If you provide your mobile number at checkout we will also send delivery updates straight to your phone so you can keep an eye on progress.
- If a product is marked as "Dispatched within 3 working days" delivery usually takes around 3 to 5 working days from when your order is placed.
- 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.
