If you are experiencing pinion bearing noise in your vehicle, it is not recommended to drive for an extended period of time. Ignoring the noise and continuing to drive can cause further damage to the pinion bearing, leading to more costly repairs in the future. It's important to have your vehicle inspected by a qualified mechanic as soon as possible to determine the cause of the noise and to prevent any further damage to your vehicle. Continuing to drive with a bad pinion bearing can also cause other components of your drivetrain to wear prematurely and may lead to more severe problems down the line.