LEGO’s Technic differentials are as beautifully simple and effective as the real-world versions fitted to every vehicle’s driven axel/s. But they’re rubbish off road. The solution, just like real-world off-roaders, is a diff lock. This means you can go around corners when on the road, then lock the diffs for off-road and keep all your wheels turning when things get slippery. Want to see how it works? Then check out Ryen Air‘s black 4×4 in the video below…

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