02Z409021S Audi DIFFERENTI

Basically, it lets your wheels rotate at different speeds. Now, when you’re going straight, both wheels turn the same rate, pretty simple. But when you’re turning a corner, the outside wheel has to travel a longer distance than the inside wheel. The differential allows for that difference in speed without binding up or causing damage. It does this using a set of gears inside the housing—some gears spin faster, some slower, and it all happens smoothly. It also distributes power from the engine to the wheels. It’s a core part of your drivetrain, sitting right in between your axles. It receives the engine's power through the driveshaft, and then it splits that power to each wheel. Think of it as the final piece of the puzzle getting that power down to the road. Without it, turning would be a real struggle—imagine trying to turn with wheels locked together! It’s pretty vital, honestly. If your differential goes bad, you’ll notice if you’re turning, you'll get noises – whining, clicking, or even banging sounds. It could also cause vibrations, or even make it difficult to steer. It’s a tough component, but like anything it wears out. If you're hearing something off, ignoring it isn’t going to make it better. You can find replacements pretty easily, and a site like Fixparts Online has a good selection. It acts like a shield protecting the rest of your drivetrain, so when it fails it can take other things with it. It's one of those parts you don’t think about until it’s causing a problem, but it's absolutely essential for a smooth, safe ride. Expert assistance: Differential (MPN 02Z409021S) is covered by a 12-month warranty!

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