If you are planing on running a lift anyway,
the frame design is not a major issue
Here is where you need to search:
http://www.pirate4x4.com/forum/forumdisplay.php?f=17
Hint:
you need to be a paying member to search on PBB, to bypass that go to Google,
Click advance search and fill the fields
what you are searching for is SAS, or straight axle conversion, or swap.
Just a sample:
http://search.yahoo.com/search;_ylt=...2=sp-qrw-corr-