Part required to convert the MetriCK's solid rear axle to a ball diff. Please note some diffs may come with 4202 Lightened Diff Rings.

You will also need DIFF BALLS! The size of the diff ball you need will be based on the gear you use. We have light weight CRC 1227 2.5mm diff balls for CRC Spur gears.

And finally you will need DIFF GREASE. The Hiro Seiko Differential Paste is one of the best on the market, providing smooth resistance that gives you the perfect ball diff action!