Overview
The ARRMA Limited Slip Center Diff Set 50T 100k (Z-ARA310991) is a factory-assembled differential unit designed for serious RC enthusiasts who demand durability and performance from their RC cars in the UK market. This pre-assembled limited slip centre diff comes fully filled with 100k cSt silicone oil, making it ready for fast and efficient servicing without the hassle of manual assembly. Whether you're running an ARRMA 1/8 scale monster truck or speed truck, this transmission tune-up option delivers the engineering quality and reliability that competitive RC bashers and weekend warriors expect.
Limited slip differentials are essential for improving traction and handling characteristics in high-performance RC vehicles. Unlike open differentials, a limited slip design prevents excessive wheel spin and provides more balanced power delivery to both sides of your RC car during cornering and acceleration. This ARRMA differential set is engineered specifically for 1/8 scale speed models, offering the strength and precision needed to handle extreme driving conditions. If you're looking to upgrade or replace a worn centre diff on your ARRMA RC truck, this genuine factory component delivers authentic performance and longevity.
This is a genuine ARRMA OEM part, manufactured to the exact specifications required by the company's premium RC vehicles. It's an ideal upgrade for owners of compatible ARRMA models who want to maintain factory-spec performance or restore their RC cars to like-new condition. Available now with free mainland UK delivery on orders over £99, this is the perfect choice for RC enthusiasts across the United Kingdom.
Key Features
- Factory Assembled and Pre-Filled with 100k cSt Silicone Oil — The differential arrives completely assembled and filled with 100k cSt silicone oil, eliminating the need for time-consuming assembly and bleeding procedures when servicing your RC car. This saves you valuable setup time and ensures the unit is correctly filled from the factory, reducing the risk of installation errors that could compromise performance.
- Tough Steel Internal Gears — The internal gearing is machined from durable steel rather than softer materials, providing long-lasting durability and resistance to wear even under the most extreme driving conditions and high-load scenarios typical of competitive RC racing.
- Stainless Steel Limited Slip Diff Plates — Stainless steel plates are installed to create the limited slip differential action, preventing excessive wheel spin and promoting balanced power delivery for improved handling, traction and cornering performance on varied terrain.
- Strong Composite Diff Case with Integrated Steel Insert — The differential case is constructed from composite material with integrated steel reinforcement, combining the weight advantages of composite construction with the durability of steel support for maximum strength and reliability.
- 50T 1 Module Straight-Cut Steel Main Gear — This 50-tooth main gear is precision-cut in a 1 module design from steel for increased durability under extreme loads, ensuring your RC truck can handle aggressive acceleration and heavy impacts without gear stripping or failure.
- Metal Cross Shafts — The cross shafts are fabricated from metal rather than plastic, increasing efficiency, improving power transfer, and enhancing the overall longevity of the differential assembly during high-performance driving.
- Rubber Shielded Bearings — Sealed rubber-shielded bearings are included throughout the assembly, providing protection against dirt and moisture ingress whilst ensuring smooth rotation and fast, efficient installation into your RC vehicle without requiring additional bearing upgrades.
Technical Performance
The ARRMA Limited Slip Center Diff Set represents genuine OEM engineering designed for 1/8 scale high-performance RC vehicles. With its robust steel internal gears and 50-tooth straight-cut main gear, this differential is engineered to withstand the extreme loads and aggressive driving demands of modern RC sport trucks. The integration of stainless steel limited slip plates creates a balanced differential action that prevents the common problem of excessive wheel spin during cornering and acceleration, giving you more predictable handling characteristics and better traction control. The composite case with integrated steel insert provides an optimal balance between light weight and structural rigidity, whilst the metal cross shafts ensure efficient power transmission with minimal losses. Pre-filled with 100k cSt silicone oil, the viscosity provides the perfect balance for both speed and traction, and the factory assembly ensures every component is correctly positioned and sealed. Rubber-shielded bearings throughout the assembly protect against contamination while maintaining smooth rotation, and the precision engineering ensures compatibility with ARRMA EXB models including the 1/8 KRATON 6S and 1/7 TALION 6S variants.
What's in the Box
- 1 x Factory Assembled Limited Slip Center Diff
- 50T 1 Module Straight Cut Steel Main Gear
- 100k cSt Silicone Oil (pre-filled)
Frequently Asked Questions
- What is a limited slip differential and why do I need one for my RC car? — A limited slip differential uses friction plates and internal mechanisms to prevent excessive wheel spin whilst still allowing the wheels to rotate at different speeds during cornering. This improves traction, reduces understeer, and provides more predictable handling compared to an open differential. It's particularly beneficial for high-speed driving, competitive racing, and aggressive bashing where consistent performance is essential.
- Is this a genuine ARRMA part? — Yes, the Z-ARA310991 is an official ARRMA original equipment manufacturer (OEM) component, manufactured to factory specifications and supplied as a genuine spare part for compatible ARRMA vehicles.
- Which ARRMA RC models is this compatible with? — This limited slip centre diff set is compatible with the ARRMA 1/8 KRATON 6S EXB 4X4 RTR Speed Monster Truck (model C-ARA8708V6T1) and the ARRMA 1/7 TALION 6S EXB 4X4 RTR Speed Truck (model C-ARA7707V6T1).
- Do I need to assemble this differential myself? — No, this is a factory-assembled unit that arrives fully constructed and pre-filled with 100k cSt silicone oil, ready for installation into your RC vehicle. This saves time and eliminates the risk of improper assembly.
- What does the 100k cSt silicone oil do? — The silicone oil provides the correct viscosity for optimal differential performance, affecting the locking characteristics and responsiveness of the limited slip mechanism. The 100k cSt weight is specifically formulated for this differential design.
- Can I use a different viscosity of oil in this differential? — Whilst the unit comes pre-filled with 100k cSt oil and this is the recommended specification, some drivers experiment with different viscosities to fine-tune handling characteristics. However, using the correct factory specification is recommended for optimal performance.
- How often should I service this differential? — Regular maintenance depends on driving frequency and conditions. For competitive racing, servicing every few months is typical, whilst casual bashers may service less frequently. Always follow ARRMA's maintenance guidelines for your specific vehicle.
- Is this suitable for beginners? — Differential maintenance and installation requires moderate mechanical knowledge. Whilst the unit comes pre-assembled (making installation easier), understanding how to properly install and maintain a centre diff is best suited to intermediate RC enthusiasts with some experience with RC car setup and maintenance.
- What is the difference between limited slip and open differentials? — An open differential allows each wheel to spin independently, which can result in excessive wheel spin during cornering. A limited slip differential uses friction plates to limit this independent rotation, providing better traction and more predictable handling characteristics during aggressive driving.
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 Limited Slip Center Diff Set 50T 100k Z-ARA310991 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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