Gear differentials have been the norm in 1/8-scale cars for quite a while, but it has only been since the release of short course trucks that they’ve found their way into many RTR and race-level 1/10-scale cars and trucks. A gear diff requires little maintenance and is very durable, which is why they have become the norm for entry-level cars, but their consistency and ability to be tuned with different oils makes them ideal for any track condition. Properly building a gear diff is very easy, and routinely changing the fluid or grease is a great way to keep that ...
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