- Brand: ARRMA
- Model Number: ARA310958
- Part Type: Differential Set
- Compatibility: 1/7 INFRACTION 6S 4x4, 1/7 LIMITLESS 6S 4x4, 1/8 TYPHON 6S 4x4
- Main Gear: 43T Steel Straight Cut
- Oil Viscosity: 7k cSt Silicone Oil
- Internal Gears: Hardened Steel
- Diff Case Material: Reinforced Composite
- Cross-Shafts: Metal
- Inserts: Metal
- Bearings: Included
- Pre-Assembly: Factory Assembled
- Pre-Filled: Yes, with 7k cSt Silicone Oil
- Includes: 1 x Factory Assembled Front or Rear Differential Unit, 43T Steel Straight Cut Main Gear, 7k cSt Silicone Oil
Overview
The ARRMA Front Rear Diff Set with Straight 43T 7k Oil (ARA310958) is an essential replacement component for RC enthusiasts who demand reliability and durability from their vehicles. Whether you're running a 1/7 scale INFRACTION, 1/7 LIMITLESS, or 1/8 TYPHON model, this factory-assembled differential unit arrives pre-filled and ready to install, eliminating the need for manual assembly and oil filling. This is the ideal solution for RC car UK owners who want to service their differentials quickly and efficiently without compromising on performance or longevity.
Designed and engineered by ARRMA, one of the industry's most respected manufacturers of high-performance brushless RC vehicles, this diff set represents the same quality standards found in their ready to run RC trucks and buggies. The pre-assembled nature of this component makes it perfect for both experienced racers and dedicated weekend bashers who understand the importance of regular differential maintenance. By choosing a factory-assembled unit like this, you're investing in consistency, reliability and the peace of mind that comes with using genuine OEM replacement parts.
The 43T straight cut steel main gear and 7k cSt silicone oil combination has been specifically engineered to provide the optimal balance of performance and durability across a wide range of driving conditions, from high-speed circuit racing to aggressive off-road bashing. This is a genuine ARRMA component that will keep your RC model performing at its best.
Key Features
- Factory Assembled and Pre-Filled — This differential unit arrives completely assembled and filled with 7k cSt silicone oil, meaning you can install it directly into your vehicle without spending time on manual assembly or oil filling, allowing you to get back to driving faster and more efficiently.
- 43T Straight Cut Steel Main Gear — The straight cut design of the main gear provides increased durability under extreme loads compared to other gear types, making this component ideal for aggressive driving styles and high-performance RC applications where gear strength is critical.
- Tough Steel Internal Gears — All internal gears are manufactured from hardened steel rather than softer materials, delivering long-lasting durability in all conditions whether you're racing on tarmac, bashing in the garden, or tackling off-road terrain.
- Strong Composite Diff Case — The housing is constructed from a reinforced composite material that balances strength with weight efficiency, providing protection for the internal components whilst maintaining the lightweight characteristics essential to RC performance.
- Metal Cross-Shafts and Inserts — The use of metal cross-shafts and inserts instead of plastic alternatives increases the efficiency of fit and extends the working lifespan of the differential, reducing wear and maintaining consistent performance over time.
- Bearings Included — This complete unit includes all necessary bearings, ensuring fast and efficient installation to your vehicle without the need to source additional hardware or compatibility components.
- 7k cSt Silicone Oil — The included silicone oil viscosity of 7000 centiStokes has been formulated to provide optimal performance across the temperature ranges experienced during both high-speed racing and casual recreational driving.
Technical Performance
This differential set delivers exceptional performance characteristics through its carefully engineered combination of components. The 43T straight cut steel main gear represents a significant step up in durability compared to standard gears, particularly when subjected to the extreme loads generated during acceleration, cornering and rough terrain driving. The straight cut tooth profile ensures positive engagement between the pinion and main gear, reducing slippage and improving power delivery to the wheels. The use of high-quality steel throughout the internal gear assembly means the differential can withstand repeated stress cycles without degradation, making it suitable for competitive racing environments where reliability under sustained high performance is paramount, as well as for casual RC bashers who demand durability without compromise. The composite diff case strikes an intelligent balance between weight and strength, providing adequate protection for internal components without adding unnecessary mass that would negatively impact acceleration, handling and battery runtime. The metal cross-shafts and inserts are engineered to maintain tight tolerances over extended use, which translates to consistent differential action and predictable handling characteristics. The 7k cSt silicone oil has been selected to provide smooth operation across typical driving temperatures whilst maintaining sufficient viscosity to protect all moving parts. This complete unit is suitable for a range of ARRMA vehicles including the 1/7 scale INFRACTION 6S 4x4 RTR brushless all-road street bash model, the 1/7 LIMITLESS 6S 4x4 RTR brushless street speed model, and multiple variants of the 1/8 TYPHON 6S 4x4 brushless buggy platform, demonstrating its broad applicability across ARRMA's performance-oriented product line.
What's in the Box
- 1 x Factory Assembled Front or Rear Differential Unit
- 43T Steel Straight Cut Main Gear
- 7k cSt Silicone Oil (pre-filled)
- Bearings (included in assembly)
Frequently Asked Questions
- Is this differential set suitable for my ARRMA RC model? — This differential set is confirmed compatible with the 1/7 INFRACTION 6S 4x4 RTR brushless all-road street bash model, the 1/7 LIMITLESS 6S 4x4 RTR brushless street speed model, and multiple 1/8 TYPHON 6S 4x4 variants including standard and TLR tuned versions. Always verify your specific model number against the compatibility list before ordering to ensure correct fitment.
- What does the 43T rating mean on the main gear? — The 43T designation refers to the number of teeth on the straight cut main gear. This 43-tooth configuration has been engineered by ARRMA to provide the optimal balance between durability and performance for their range of vehicles, ensuring reliable operation under both racing and bashing conditions.
- What is 7k cSt oil and why is it important? — The 7k cSt measurement refers to the viscosity or thickness of the silicone oil, measured in centistokes. This specific viscosity has been selected to provide smooth differential action whilst offering adequate protection to internal components across the temperature ranges experienced during typical RC driving sessions, whether you're running brief high-intensity races or longer recreational driving sessions.
- Do I need to refill the oil when I install this differential? — No, this is one of the key advantages of purchasing a factory-assembled unit. The differential arrives completely filled with 7k cSt silicone oil, so you can install it directly into your vehicle without any additional preparation or maintenance steps.
- Why is this a straight cut gear design? — Straight cut gears, as opposed to bevel or spur designs, provide superior strength under extreme loads because the teeth are cut at a 90-degree angle to the gear face. This design is particularly beneficial for high-performance driving where aggressive acceleration and cornering loads place stress on the differential components.
- How often should I replace this differential? — The frequency of differential replacement depends entirely on your driving style, maintenance habits and the conditions in which you operate your RC model. Regular inspection of the differential during routine maintenance will help you identify when replacement is necessary. Signs of wear or unusual noise may indicate it's time for a service interval.
- Will this improve my RC car's handling? — Installing a quality differential in good working condition helps maintain predictable and consistent handling. This factory-assembled unit ensures all internal components are properly matched and filled with the correct oil viscosity, supporting optimal differential action and responsive handling characteristics.
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 Front Rear Diff Set, Straight 43T 7k Oil 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.
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