If it is like a whirring whine that is probably a normal 4X4 noise. Any other noise I'd be looking into as a problem.
You replace them ! :)
NO YOU CAN NOT. It will not lube the engine bearings.
NO Rear bearings are lubricated with the rear end / gear oil.
Typical of worn bearings....crank, cam and rod bearings.
You can't, They are a sealed bearing that's in the hub Assy.
do you have link and program a 88 cilverado ecm when replacing
One way that I experienced is that I felt a vibration on my suburban when I reached a certain speed, about 30 mph. Then again at 60 mph. Or thereabouts. Also, get under your Silverado and try moving the center bearing. If it has a considerable amount of play, time to change it. However, are you sure that it's the center bearing that needs replacing and is that why you're asking. Chevy center bearings last a long, long time.
bearings inside your sterring colum need replacing
I just wrote an article for this procedure on a 1990 Silverado if it helps! http://blog.jamestilberg.com/archives/274-Replacing-an-Alternator.html <a href="http://blog.jamestilberg.com/archives/274-Replacing-an-Alternator.html">http://blog.jamestilberg.com/archives/274-Replacing-an-Alternator.html</a>
195 to 210 is normal
below the radiator cap in the gas tank right behind the exhaust bearings
190 to 200 degrees is perfect. / NORMAL.