Noise from 4WD differential.?

I thought I had bad wheel bearings so I brought my 2003 chevy s10 to STS for a free eval. They said they "think" it is the 4WD differential. The symptom is I hear a grinding noise when going around corners, but not all the time. If it is the differential, what is the danger in not getting it fixed right... show more I thought I had bad wheel bearings so I brought my 2003 chevy s10 to STS for a free eval. They said they "think" it is the 4WD differential. The symptom is I hear a grinding noise when going around corners, but not all the time. If it is the differential, what is the danger in not getting it fixed right away... I have to drive the truck from NJ to FL next month... the truck seems to run just fine... what are you thoughts?
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