Yokomo BD-508 Diff Tension Adjustment Kit for BD7/BD5  [BD-508]

BD-508 Differential Tension Upgrade for BD7/BD5

This Yokomo BD-508 kit is a compact adjustment set for BD7 and BD5 scale RC differentials, providing a dedicated tension screw and a matched tension spring to alter differential preload. It is intended for fine-tuning corner behaviour and traction balance on track-focused RC touring cars.

The parts are straightforward to fit into compatible BD-series differential housings, and they let you incrementally change preload without replacing the entire diff assembly. Use this kit when small changes to spool-up or roll resistance are needed during setup sessions.