8 3/4 rearend housing

Steve, the word I've always heard is, never attempt it without a jig. You can do a search on this forum and get info on it as it has been discussed quite a bit. Below is a link to all info you will probably ever want to know about 8 3/4 rears, including dimensions that you will need. Hope this helps. Mike
http://www.moparts.com/Tech/Archive/axle/21.html