Overview
The ARRMA Front Rear Diff Set 42T GP5 10k is a premium replacement differential unit designed for serious RC enthusiasts who demand reliability and performance from their RC car UK setup. Whether you're running an ARRMA Felony 6S BLX or Infraction 6S BLX, this factory-assembled differential set delivers the durability and efficiency needed for consistent performance across all driving conditions. This is an essential spare part for anyone looking to maintain their brushless RC vehicle at peak performance or upgrade their drivetrain components for enhanced durability under extreme loads.
As a pre-assembled and factory-filled unit, this differential set arrives ready to install, eliminating the need for time-consuming assembly and oil filling. The combination of tough steel internal gears, a strong composite diff case, and a 42T GP5 straight cut steel main gear makes this an ideal choice for RC bashers and racers who push their vehicles to the limit. The inclusion of rubber-shielded bearings ensures fast and efficient installation whilst maintaining the durability standards ARRMA is renowned for across the RC hobby market.
Perfect for hobbyists who understand the importance of regular maintenance and differential servicing, this genuine ARRMA component guarantees compatibility and performance with your existing vehicle. The 10k cSt silicone oil fill provides the optimal balance of viscosity for fast and efficient operation, whether you're tackling carpet, concrete or outdoor terrain.
Key Features
- Factory Assembled and Pre-Filled — This differential arrives completely assembled and filled with 10k cSt silicone oil, meaning you can remove it from the box and install it directly into your vehicle without any additional preparation, saving you valuable setup time.
- Tough Steel Internal Gears — The use of steel internal gears throughout the differential ensures exceptional durability and longevity, allowing your RC car to withstand the punishment of intense driving sessions in all conditions without premature wear or failure.
- 42T GP5 Straight Cut Steel Main Gear — The 42-tooth main gear with GP5 (gear profile 5) geometry and straight cut design is engineered for increased durability under extreme loads, making it perfect for high-power brushless setups and aggressive driving styles.
- Strong Composite Diff Case — The composite differential case provides the optimal balance between strength and weight, offering excellent impact resistance whilst keeping the overall drivetrain light and efficient for improved performance.
- Metal Cross-Shafts and Inserts — These precision-engineered metal components replace plastic alternatives, delivering increased efficiency of fit and superior long-lasting durability that translates to more consistent performance lap after lap.
- Rubber-Shielded Bearings — The inclusion of rubber-shielded bearings ensures fast and efficient installation whilst protecting the bearing surfaces from dirt and debris, extending the service life of your differential.
Technical Performance
The ARRMA Front Rear Diff Set 42T GP5 10k represents a serious upgrade and maintenance solution for ARRMA 6S BLX vehicles. Built with premium materials and precision engineering, this differential features tough steel internal gears that can handle the output of high-performance brushless motors without stripping or wearing prematurely. The 42-tooth straight cut main gear with GP5 profile geometry is specifically designed to distribute loads more effectively across a wider tooth contact area, reducing stress concentration and extending component lifespan under extreme conditions. The metal cross-shafts and inserts replace standard plastic components, providing superior mechanical efficiency and durability that matters when you're pushing your RC car UK to its absolute limits. Pre-filled with 10k cSt silicone oil, this differential is calibrated for fast and responsive power delivery whilst maintaining smooth operation across the entire RPM range of modern brushless systems. The rubber-shielded bearings provide protection against environmental contamination whilst allowing for quick installation without the need for re-oiling or extensive service procedures. This is a genuine ARRMA component manufactured to OEM specifications, ensuring perfect fit and compatibility with Felony 6S BLX and Infraction 6S BLX models.
What's in the Box
- 1 x Factory Assembled Front or Rear Differential Unit
- 42T GP5 Straight Cut Steel Main Gear
- 10k cSt Silicone Oil (pre-filled)
What You Need to Complete
- ARA311016 - MAIN INPUT GEAR 15T GP5 (required for complete differential assembly)
Frequently Asked Questions
- Which ARRMA vehicles is the Front Rear Diff Set 42T GP5 10k compatible with? — This differential set is compatible with the ARRMA Felony 6S BLX (available in Orange and Black variants) and the ARRMA Infraction 6S BLX (available in Silver and Blue variants). Always check your model number before purchasing to ensure compatibility.
- Does the differential come ready to install? — Yes, this is a factory-assembled and pre-filled unit, meaning it arrives ready for immediate installation into your vehicle. No additional assembly, gear meshing or oil filling is required, making it an ideal solution for quick maintenance and servicing.
- What does GP5 gear profile mean? — GP5 refers to Gear Profile 5, a specific tooth geometry design that affects how the main gear meshes with pinion gears. This profile is optimised for ARRMA 6S BLX vehicles and provides the right balance of efficiency, durability and responsiveness for these platforms.
- Why is the 42T main gear better than alternatives? — The 42-tooth count is the standard specification for ARRMA 6S BLX differentials and provides the optimal gear ratio for these vehicles. The straight cut tooth design (as opposed to helical) distributes loads more directly and reduces component stress, making it ideal for high-power brushless systems and aggressive driving.
- What viscosity is the silicone oil and why does it matter? — The differential is filled with 10k cSt (centistoke) silicone oil, a medium viscosity that balances smooth operation with effective load distribution. This viscosity is specifically calibrated for ARRMA 6S BLX vehicles and ensures optimal performance across different driving conditions and temperatures.
- Is this suitable for maintenance or upgrade purposes? — This differential set is perfect for both scheduled maintenance and performance upgrades. If your existing differential is worn or damaged, this factory-assembled unit makes replacement quick and straightforward. The steel gears also make it an attractive upgrade option for bashers seeking increased durability.
- What is the difference between front and rear differentials? — Whilst this product works as either a front or rear differential, the installation location determines how it distributes torque between the wheels on that axle. The 42T GP5 specification is appropriate for either position on compatible ARRMA models.
- Do I need any tools to install this differential? — Installation requirements depend on your familiarity with RC vehicle assembly. You'll need standard RC maintenance tools, but the pre-assembled nature of this unit means you won't need gear meshing tools or oil syringes, significantly simplifying the installation process compared to building a differential from individual components.
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 Front Rear Diff Set 42T GP5 10k 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.
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- 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.
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