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VehiclesArrma Mojave Grom MEGA 380UpgradesOil-filled front and rear differentials

Oil-filled front and rear differentials

Arrma Mojave Grom MEGA 380 · ARA2104

Sealed, oil-filled axle differentials give you a defined oil setting to tune how drive is shared between the wheels. They require drivetrain disassembly and later oil service, so inspect the fitted parts before replacing a working pair.

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Parts & installation

Manufacturer documented
Vehicle
Arrma Mojave Grom MEGA 380ARA2104
Position
front / rear
Change
Replace the front and rear differential assemblies with factory-filled 3000cSt oil differentials.

Parts needed

Both axles: one pair or two single sold packs
PartQty
ARA311193ARRMA Assembled Oil Filled Differential 30T 0.8Mod, 3000cSt Oil (2): GROM1

Manufacturer-documented offering for the exact brushed edition; no measured traction or service-life improvement verified. Check the fitted revision before ordering.

Installation notes

  • Applies to the brushed ARA2104 edition. Inspect the installed differential first; later service revisions and secondhand modifications can differ from the original exploded drawing.
  • Replace the two complete axle differentials as assemblies; retain the original differential covers, chassis, input gears, center driveline and cover fasteners. The ARA311193 package includes its differential bearings.
  • Use the factory 3000cSt fill as the package baseline. Oil viscosity changes differential action; no optimum oil for every surface or measured traction/durability improvement is established here.
  • This mechanical change requires no new transmitter, receiver, servo, motor, ESC, battery, charger, spur or pinion. Keep the original supported 2S brushed power system and stock wheels.
  • ARA311193 is discontinued. The manufacturer links the one-piece ARA-3067 alternate; two singles replace a pair. Exact ARA-3067 fitment is presently confirmed here only for Granite ARA2102.
  • A first-generation Mojave owner reported installing this pair and the metal axle package. The same build later lost a rear dogbone; do not treat either package as proof against every drivetrain failure.

Sources

ARRMA oil-filled differential pair, ARA311193
  • Maker product information, applicable models and supporting parts.
ARRMA Mojave Grom MEGA 380 ARA2104
  • Maker product information, applicable models and supporting parts.
ARRMA ARA2104 exploded view
  • Maker instructions and assembly diagrams for the stated parts and configuration.
Brushed Mojave Grom owner build and later repairs
  • Original owner discussion. Installation details and reported behavior apply to the build described.