These hardened steel differential spider gears are an aftermarket replacement built for TRAXXAS E-REVO style 1/10 4WD diffs. Supplied as part number ER1200S/G2, the set swaps out softer factory alloy or plastic spiders to give better wear resistance during high-load running.
Fitting is straightforward for anyone with basic diff service experience: open the diff, remove the carrier, replace the spider gears, verify gear engagement and clearances, then refill with the diff oil you prefer. No special tools are included beyond common hobby tools.
As a tuning item, steel spider gears focus on durability rather than changing handling dramatically. They keep gear engagement steadier under heavy torque, which is useful when using stronger motors or aggressive gearing and helps reduce the need for frequent gear replacement.
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