ARRMA ARA-3067 Assembled Oil Filled Diff 30T

This ARRMA assembled oil-filled differential comes built with a 30-tooth 0.8 MOD ring gear and pre-filled with 3000cSt silicone diff fluid — a complete drop-in diff replacement for the GROM platform. Diff building is fiddly work at any scale; at GROM scale it's genuinely tricky, and this unit skips all of it.

The differential arrives factory-assembled, shimmed, sealed, and filled, so gear mesh and fluid volume are exactly to spec out of the package. The 3000cSt fill delivers the stock balance of on-power drive and off-power rotation the GROM platform is tuned around.

A worn diff shows up as clicking under load or a truck that unloads its inside wheel out of corners — and at this price, swapping the complete assembled unit is faster and more reliable than rebuilding.

Fitment is the ARRMA GROM platform including the Quake GROM — confirm against your model's exploded parts diagram. The package includes one assembled, oil-filled 30T differential.