This link to Moparts has some interchange information and mentions the 11x3" brakes found on C & D bodies.
http://www.moparts.com/Tech/Archive/brake/6.html
Not really enough information to determine what is involved to make the swap if possible.
http://www.moparts.com/Tech/Archive/brake/6.html
Not really enough information to determine what is involved to make the swap if possible.