Not knowing the extent of wear I can't answer that question with any degree of accuracy. I suggest replacing the bad hub/bearing assembly if you can hear the bearing rumble.
Depends on how bad it is....but I wouldn't advise driving it at all. A bad harmonic balancer can distort the front end of the crank and beat the main bearings to pieces. You are looking at creating a lot more damage if you continue to drive it.
You can drive until the bearings fail, but this risks causing other damage and making the repair more expensive. If you know the bearings are failing and you don't plan on getting rid of the car in the near future, you may as well bite the bullet and get the bearings replaced.
No, bad front wheel bearings would not prevent a transmission from shifting. If your car has bad front wheel bearings you will notice wheel noise or wheel looseness.
only if your willing to risk you wheel falling off. In other words it's not safe.
Need more information. Are you referring to wheel bearings, transmission bearings, differential bearing, etc. Also what type of vehicle is this? If your talking about front wheel bearing on a front wheel drive car, there are no specs or adjustments. Any play means the bearing is bad. Same goes for most 4WD vehicles. Front wheel bearing on a rear wheel drive also should not have play but if they are in good shape, they can be repacked and tightened to spec.
Bad ball bearings. Check to see the bearings and the casing does not need to be replaced.
Yes, the wheel bearings or CV joint could be bad.
Until the wheels fall off. If one knows they need to be replaced, it should be done with great expediency, and soon.
You need to check the front wheel bearings, while driveing down the road stright turn the steering to the left and then to the right and listen to see if the hum noise changes, if not then both bearings are bad left and right sides. If the hum noise changes while turning to the left then right front bearings are bad , if hum noise changes while weaven to the right then left bearings are bad.
Scalloped tires, Bad wheel bearings,
bad wheel bearings
Bad bearings inside or loose castle nut.