Have a 98 ford f150 5.4 2wd 8ft bed.  The center support bearing went out.   I took off old one, measured the old bearing and it was 1.37" and replaced with same size.  I put the new bearing on and tightened the nut for the spindle. Secured everything back into place.  

I started to drive it and now the bearing is making a high pitched noise like a rubbing and or grinding.  So I took the driveshaft off and checked the bearing, everything looked good but as I spun it on the axle it was squeaking.

I reinstalled the drive shaft and still continues to make that noise.  I almost think the bearing is the wrong one and or it has no grease inside.  

What should I do?

Thanks