How long you can drive with a pinion bearing noise is nearly impossible to tell, it might fail after 100 feet or 100,000 miles.
Pinions are found in cars with rack and pinion steering systems, and cars with rear-wheel drive. They’re small gears that help larger gears rotate faster, and pinion bearings make that rotation smoother and more efficient. The bearing will start making loud whirring noises when it wears out, and that’s what you’re hearing.
If the pinion bearing completely fails, the steering wheel might be slightly more difficult to turn, or cause premature tire wear. In some instances it can even cause damage to your transmission, driveshaft, or differential.
Replacing a pinion bearing costs around $200 to $400 on average, and we recommend having it serviced as soon as possible. It’s not necessarily common for a blown pinion bearing to damage other components when it fails, but it’s not something you should throw the dice on either.
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