This is a four-piece O-ring kit made for the gear differential in drift applications, installed at the axle mounting points to prevent oil seepage on RC models. The set replaces worn seals during scheduled maintenance or when refreshing a drift differential's sealing surfaces.
Its sole function is to seal the axle/differential junction to keep diff oil contained and protect internal lubrication so the differential keeps predictable behaviour while drifting. Fitment is straightforward and usually performed when the differential carrier is opened for maintenance.
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