One wheel wonder to Posi

I have a 1968 chevelle in which I think has 3:56 gears in it. It's a one wheel wonder and I would like to make it posi. What are some good brands for posi units? Is Eaton pretty good?

Also, what all do I have to do to place the new unit in there?

Thanks!
Matt

http://www.jegs.com/cgi-bin/ncommerce3/ProductDisplay?prrfnbr=1189&prmenbr=361

http://www.jegs.com/cgi-bin/ncommerce3/ProductDisplay?prrfnbr=45242&prmenbr=361

http://store.summitracing.com/default.asp?Ntt=posi&Ntk=KeywordSearch&DDS=1&searchinresults=false&N=0&target=egnsearch.asp&x=29&y=12

http://www.powertrax.com/

Check these web sites. Also Check Chevy Highperformance and Super Chevy web site for articles.

The Powertrax is the way to go if your rear is ok now. You can do this your self in the drive way and hand tools.

Thanks for your help! I'll take a look at these websites.