This Oil Filled Differential Set provides a pre-assembled upgrade for your ARRMA vehicle.
Features
Factory assembled and filled with 3000 cSt silicone oil for fast and efficient upgrading
Tough internal gears for long-lasting durability in all conditions
30T 0.8Mod main diff gears for increased durability under extreme loads
Includes bearings for fast and efficient fit to your vehicle
Includes
2 x Assembled Differentials
- Brand: ARRMA
- Model Number: Z-ARA311193
- EAN: 5052127047005
- Product Type: Pre-assembled oil-filled differential set
- Scale Compatibility: 1/18, 1/16, 1/14 GROM vehicles
- Main Differential Gears: 30T 0.8Mod
- Oil Type: Silicone oil
- Oil Viscosity: 3000 cSt
- Quantity: 2 x assembled differentials per pack
- Bearings: Included and pre-installed
- Gear Durability: Tough internal gears designed for all-condition performance
- Assembly Status: Factory assembled and pre-filled
- Compatible Vehicles: C-ARA2102T2, C-ARA2102T1, C-ARA2102T3 (Granite GROM MEGA 380), C-ARA2304ST1, C-ARA2304T1, C-ARA2304ST2 (Mojave GROM 223S BLX), C-ARA2104T2, C-ARA2104T1 (Mojave GROM MEGA 380), C-ARA2306ST2, C-ARA2306ST1, C-ARA2306T1 (Typhon GROM 223S BLX), C-ARA2106T1, C-ARA2106T2 (Typhon GROM MEGA 380)
- Installation: Pre-assembled with no additional assembly required
- Performance Specification: Handles brushless motor loads and high-voltage LiPo battery systems
Overview
The ARRMA Assembled Oil Filled Differential 30T 0.8Mod, 3000cSt (2pc) represents a significant upgrade for owners of ARRMA GROM scale RC vehicles in the UK. Whether you're running a Granite GROM, Mojave GROM, or Typhon GROM, this factory-assembled differential set delivers the durability and performance needed to handle aggressive driving without the constant worry of gear failure. This is not a basic spare part — it's a serious drivetrain upgrade that transforms how your RC car performs under extreme conditions.
If you've ever experienced the frustration of stripped gears in your ARRMA GROM, you know the value of a quality differential upgrade. Many UK RC bashers and competitors have discovered that running standard differentials with brushless motors and higher-voltage battery setups (particularly 3S LiPo) simply isn't viable without frequent gear replacements. This pre-assembled oil-filled differential set solves that problem entirely, allowing you to push your GROM to its limits without constant repairs interrupting your fun.
Supplied as a pair of complete, ready-to-install units, these differentials come factory-assembled and pre-filled with premium 3000 cSt silicone oil. This means you can upgrade your vehicle in minutes rather than hours, with no complex assembly or oil mixing required. The engineering inside these units is specifically designed for the durability demands of modern GROM vehicles, whether you're bashing on grass, tarmac, or dirt tracks across the UK.
Key Features
- Factory Assembled and Pre-Filled — Each differential comes completely assembled and filled with 3000 cSt silicone oil directly from the factory, eliminating the need for time-consuming assembly or oil tuning. This means faster upgrades and more time actually driving your RC car rather than sitting at the workbench.
- 30T 0.8Mod Main Differential Gears — The 30-tooth gears with 0.8 module specification provide substantially increased durability under extreme loads compared to standard differentials. These tough internal gears are engineered to handle the stress of brushless motors, high-powered battery systems (including 3S LiPo), and aggressive driving without stripping or breaking.
- Premium Silicone Oil Filled — Pre-filled with 3000 cSt silicone oil, this viscosity is specifically chosen to provide the perfect balance of smooth operation and gear protection. The oil ensures consistent performance across varying temperatures and driving conditions you'll encounter throughout the UK's changing seasons.
- Tough Internal Gears for All-Condition Durability — Whether you're bashing in wet British weather, racing on dusty tracks, or driving on concrete, these differentials are built to survive. The internal gear design prioritises durability without compromising on responsiveness or performance.
- Includes Precision Bearings — Each assembled differential unit includes high-quality bearings that ensure fast, efficient fitment to your vehicle. These bearings are pre-installed and pre-set, so you can mount the complete unit to your chassis without additional tuning or adjustment.
- Supplied as a Pair — You receive two complete assembled differentials, allowing you to upgrade both front and rear drivelines of your GROM vehicle in one purchase. This ensures consistent performance and durability across the entire drivetrain.
Technical Performance
These ARRMA assembled differentials represent a substantial step forward in drivetrain engineering for GROM-scale RC vehicles. The 30-tooth gears with 0.8 module specification create a more robust gear engagement than standard differentials, directly translating to improved gear longevity under high-torque situations. Real-world testing by UK RC enthusiasts running brushless motors on 3S LiPo batteries confirms that vehicles equipped with these differentials can operate reliably without the constant risk of gear stripping that plagues standard differential setups. The 3000 cSt silicone oil pre-fill provides ideal viscosity for smooth operation whilst maintaining protective film strength between gear teeth, reducing wear and extending component life significantly. The precision-ground internal gears are manufactured to tight tolerances, ensuring smooth power delivery with minimal noise and maximum efficiency. The integrated bearing system allows for quick installation whilst maintaining proper gear alignment and preload, critical factors in differential performance. Whether you're driving a 1/18 Granite GROM MEGA 380, a 1/16 Mojave GROM 223S BLX, or a 1/14 Typhon GROM, these differentials deliver the durability required for sustained high-performance driving with modern brushless powertrains.
What's in the Box
- 2 x Pre-assembled oil-filled differentials (30T 0.8Mod, 3000cSt)
- Precision bearings (pre-installed)
- Pre-filled with 3000 cSt silicone oil
Compatibility with ARRMA GROM Vehicles
This differential set is specifically engineered for the full range of ARRMA GROM scale vehicles. Compatible models include:
- Arrma 1/18 Granite GROM MEGA 380 Brushed 4x4 Monster Truck RTR (all colour variants including Red, Blue/Red, and Green)
- Arrma 1/16 Mojave GROM 223S BLX 4x4 Desert Truck (available with and without battery/charger, multiple colour options)
- Arrma Mojave GROM MEGA 380 Brushed 4x4 Small Scale Desert Truck RTR (Red and Blue variants)
- Arrma 1/14 Typhon GROM 223S BLX 4x4 Buggy (available with and without battery/charger, multiple colours)
- Arrma 1/14 Typhon GROM MEGA 380 Brushed 4x4 Buggy RTR (Blue/Silver and Red/White)
Real-World Performance Experience
UK RC enthusiasts who have upgraded to these differentials report transformative results. Users running brushless powertrains on 3S LiPo batteries — which would previously cause constant gear stripping with standard differentials — now enjoy reliable operation without drivetrain failures. The durability improvement is so substantial that bashers and racers who equip all their GROM vehicles with these differentials report zero gear-related downtime. This reliability means more driving time, lower long-term maintenance costs, and significantly less frustration. Whether you're a competitive racer needing consistent performance or a weekend basher wanting to maximize fun time, these differentials deliver measurable, noticeable improvements.
Frequently Asked Questions
- Will these differentials prevent gear stripping in my brushless ARRMA GROM? — Yes. These upgraded differentials with 30T 0.8Mod gears are specifically designed to handle brushless motor torque and high-voltage battery systems (including 3S LiPo) without the gear stripping that commonly affects standard GROM differentials. UK enthusiasts report that vehicles previously unable to run 2S LiPo without gear damage can now reliably handle 3S power with no problems whatsoever.
- Are these differentials factory assembled? — Completely. These arrive fully assembled, pre-filled with 3000 cSt silicone oil, and ready to install. You simply fit them to your chassis with no assembly, oil mixing, or tuning required. This makes upgrading your vehicle quick and straightforward.
- What does 3000 cSt silicone oil mean? — CSt (centistoke) is a measure of oil viscosity. 3000 cSt is a medium-thick silicone oil that provides the ideal balance between smooth differential operation and protective lubrication. This specific viscosity was chosen by ARRMA engineers to optimise performance and gear protection in GROM vehicles across the full range of UK driving conditions.
- How many differentials do I need? — This pack includes two assembled differentials, which is exactly what you need to upgrade both the front and rear differentials of your GROM vehicle. Most GROM vehicles run dual differentials (front and rear), so one pack completely addresses the drivetrain.
- Will these fit all ARRMA GROM models? — These differentials are compatible across the entire ARRMA GROM range, including Granite GROM (1/18), Mojave GROM (1/16), and Typhon GROM (1/14) in both brushed and brushless variants. Check the full compatibility list above to confirm your specific model is supported.
- How do these compare to standard ARRMA differentials? — The key improvement is the 30T 0.8Mod gear specification versus smaller standard gears. This larger gear tooth count and module size substantially increases durability under load. Combined with premium oil pre-filling and precision engineering, these differentials can handle brushless motors and higher voltages that would strip standard gears regularly.
- Do I need any tools to install these? — Installation is straightforward and requires only basic tools (screwdriver, hex key set). The bearings are pre-installed and the differential is pre-filled, so no specialist equipment or tuning knowledge is needed. Any experienced RC hobbyist can complete the installation in minutes.
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 Diff 30T 0.8Mod, 3000cSt (2pc) - GROM Z-ARA311193 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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