BrickLink - Part 62821b : LEGO Technic, Gear Differential with Inner Tabs and Closed Center, 28 Bevel Teeth [Technic, Gear] - BrickLink Reference Catalog
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The Differential - Learn How Differentials Work - Engineering Toys – S.T.E.M. Store of Canada
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New LEGO Technic differential from the 42109 Top Gear Rally Car - test & comparison - YouTube
KonHaovF 116PCS Gear and Axle Set for Technic Parts Compatible with Lego Technic Parts, DIY Gears Assortment Pack((Gears Pins Axles Differential New)) for Technic Building Blocks Set(Random Color)
Moc Technical 29pcs Technical Differential Gear Box Kit (gears, Pins, Axles, Connectors) Pack Compatible With Lego Moctsma29 - Model Building Kits - AliExpress