no i think thats correct for it to spin, but always check for specifications to
have a solid rear, on that you will have to remove the cap that
retains the seal, check with NAPA for the seal, i have seen it
sold in rebuild kits, and that impact will make it go smooth :wink:
http://www.fordmuscle.com/archives/2...ch/index.shtml
http://www.tomsdifferentials.com/catalog.asp?pg=73