- Brand: ARRMA
- Model Number: Z-ARA-3294
- Part Type: Transmission - Oil Filled Differential
- Differential Gear Tooth Count: 30T
- Gear Modulus: 0.8Mod
- Oil Type: Silicone Oil
- Oil Viscosity: 3000 cSt
- Assembly Status: Factory Assembled
- Included Components: 2 x Assembled Differentials with Integrated Bearings
- Compatible Vehicle Models: ARRMA GROM scale vehicles including Granite GROM, Mojave GROM, Typhon GROM (both brushed and brushless variants)
- Material: Steel gears with integrated bearing set
- Pre-filled: Yes, ready to install immediately
Overview
The ARRMA Assembled Oil Filled Differential 30T 0.8Mod represents a significant upgrade for your ARRMA RC vehicle, providing a factory-assembled solution that comes pre-filled with precision silicone oil. This differential is engineered to transform the durability and performance of your RC car UK setup, particularly if you own one of the popular GROM-scale models. Whether you're a dedicated basher pushing your brushless RC monster truck to its limits or a serious hobbyist seeking reliability upgrades, this differential delivers the kind of bulletproof performance that keeps your drivetrain intact under extreme conditions.
Oil-filled differentials are recognised as essential upgrades in the RC community, offering superior traction control and load distribution compared to standard open differentials. The 30T 0.8Mod gearing specification means this unit can handle the demands of high-powered 4WD RC vehicles running on 2S, 3S and higher LiPo batteries. Pre-assembled and ready to bolt straight onto your vehicle, this upgrade eliminates lengthy build sessions and gets you back on the track or trail faster than ever.
Users of ARRMA GROM models report exceptional durability improvements after installing these differentials, with many noting they can run significantly higher power levels without fear of stripped gears or differential failure. This is the kind of upgrade that transforms your RC experience from constantly replacing broken parts to enjoying extended bashing sessions with confidence.
Key Features
- Factory Assembled and Pre-Filled — This differential arrives fully assembled and filled with 3000 cSt silicone oil, eliminating the need for time-consuming assembly or oil mixing, which means you can install it immediately and start enjoying improved performance straight away.
- Premium Silicone Oil Specification — The 3000 cSt oil viscosity provides optimal traction control and load distribution across the differential gears, ensuring smooth power delivery whilst maintaining the precision needed for competitive or recreational driving.
- 30T 0.8Mod Gears for Extreme Durability — The 30-tooth, 0.8 modulus specification delivers increased strength and load-carrying capacity compared to standard differentials, allowing your RC vehicle to handle extreme conditions without gear stripping or differential failure, making it ideal for brushless power setups.
- Tough Internal Gears — The differential features robust internal gear construction designed to withstand the stresses of high-powered driving in all conditions, whether you're bashing on grass, dirt, concrete or mixed terrain.
- Complete Bearing Installation — Integrated high-quality bearings are included for fast and efficient installation to your vehicle, ensuring smooth rotation and minimal friction losses in the drivetrain.
- Ready-to-Run Upgrade Solution — Unlike many aftermarket differentials requiring assembly and tuning, this pre-assembled unit installs quickly and is immediately ready for use, making it perfect for users who want performance without complexity.
Technical Performance
This oil-filled differential represents the pinnacle of ARRMA's drivetrain engineering, combining precision manufacturing with field-proven durability. The 30T main diff gears utilising 0.8 modulus specification provide substantially greater load-carrying capacity than factory standard differentials, which typically struggle when powered by brushless motors or when running elevated power levels on 3S LiPo batteries. The 3000 cSt silicone oil fills the differential housing, creating a viscous medium that improves traction control by resisting rapid differential rotation during acceleration and cornering. This oil also provides lubrication to all internal components, reducing wear and extending service life dramatically. The engineering approach here focuses on distributing power smoothly to both wheels whilst simultaneously protecting the gears from the shock loads that cause failure in standard differentials. The integrated bearing set ensures the differential rotates smoothly with minimal friction, translating power efficiently to your wheels. Materials and construction standards reflect ARRMA's commitment to reliability, with hardened steel gears and precision-manufactured components built to withstand the rigours of competitive and recreational RC driving across UK terrain and conditions.
What's in the Box
- 1 x Assembled Oil Filled Differential 30T 0.8Mod, pre-filled with 3000 cSt silicone oil
- Integrated bearing set for installation
Frequently Asked Questions
- Will this differential stop my GROM from stripping gears? — Yes. Owners of ARRMA GROM models report that installation of this oil-filled differential eliminates gear stripping issues entirely, even when running on higher power setups. One verified user reported they could not run their GROM on 2S LiPo without stripping the original differential gears, but after installing this upgrade, they successfully run brushless powertrains on 3S LiPo batteries without any drivetrain damage whatsoever.
- What does the 3000 cSt oil do? — The 3000 cSt silicone oil acts as both a lubricant and a traction control medium within the differential. It reduces friction between internal gears, extends component lifespan, and critically, it regulates how aggressively the differential can transfer power to each wheel. This prevents the kind of sudden power transfers that cause gear failure in standard open differentials.
- Is this suitable for beginners? — Whilst this is an upgrade component rather than a complete RC car UK package, installation is straightforward for anyone with basic RC maintenance experience. The differential simply bolts onto your existing drivetrain. It's not required for beginners, but anyone running brushless motors or high-powered setups will find it essential rather than optional.
- What vehicles is this compatible with? — This differential is specifically designed for ARRMA GROM-scale vehicles including the Granite GROM, Mojave GROM, and Typhon GROM models in both brushed and brushless configurations. It is not compatible with larger ARRMA vehicles or other manufacturers' RC cars.
- How does this compare to other differential upgrades? — Unlike open differentials which offer no traction control, and unlike purely mechanical limited-slip differentials, an oil-filled differential provides progressive, velocity-sensitive traction control. The oil viscosity means traction increases naturally with demand, providing smooth power delivery without the harshness or maintenance requirements of mechanical alternatives. The factory assembly and pre-filled specification means installation is faster and more reliable than sourcing separate components.
- Will I need replacement oil? — The differential arrives pre-filled, so you won't need oil immediately. Over time, with heavy use, you may wish to service the differential and replace the oil, but this is typically only necessary after extended periods of intense 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 Assembled Oil Filled Differential 30T 0.8Mod, TBC cSt Oil (1 Z-ARA-3294 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:
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