These 3x3mm bushings swap in for diff balls to produce a spool-like drive and add toughness to the gearbox. They are popular with drivers who want steady traction and extra shock protection during rough running.
Once fitted the bushings prevent differential action so torque is shared between both wheels, which can help on loose dirt or when you need stronger rear traction.
The bushings can slip slightly under heavy impact, reducing stress on gears and pins and helping to avoid costly drivetrain damage after big hits.
The Tamiya 54424 bushings suit a range of models that use 3mm diff balls, making them a practical spare for any workshop.
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