Well I found a link for you I had one of TSM's Dana 60 kits but mine was a full floater.
http://tsmmfg.com/
The other one I know of is
http://www.azkickin.com/home.htm
But with both of these I didn't see a kit for a Chevy semi Float 60 you mite have to get some one to make one up for you.
Cethern