rear end worries==saw sumthin that worried me

Ok, lately i've noticed a slight grinding(very slight,and doesnt happen all the time)when I back up. I was just looking at http://www.bfranker.badz28.com/fbody/guides.htm at the section about changing rear end oil. they mentioned sumthing about the 2 lube holes in the diff that send oil to the axel bearings, and how the new felpro gaskets are made to cover these holes. the website gives a link to another site that explains that Police departments with GM's are complaining of axel bearing failures. I have a 95 Camaro B4C that was a highway patrol car. You'd have to see the sites your self. They explain this better than I could. Any thoughts???


http://www.socalss.com/special/holes.htm--- here is the one to look at.