Longbox...

How do tell the difference when prowling the junk yard? I might swap my HO52 4.56 for a 3.90, but I want to keep the 8 lugs and would like a full floater. Are all axles with shafts bolted to the outside of the hub full floating, or is there something else I should be looking at?
Thanks


Current fleet (subject to change w/o notice)
\'49 GMC 3/4-Ton , 60 Austin Healey Frog-eye Sprite (some assembly required), 2011 Dodge Avenger, 2015 Jeep Cherokee. No, they don't all run.
My other ride is a (B737)no, (B767)no, A320.... Update... was Embraer E190, now Boeing B787.

Knowledge is a wonderful thing, but ignorance means you don't know you can't do something.