the front diff is a 35spline f350 ford kingpin high pinion dana 60 ,dont see them in wreckers very much here in australia... and the rear is as wayne said a sterling 10.25 inch (12bolt) full floater 35 spline,the axles are 1.5" thick
. i will tidy the front up small truss to weld on the bracket over the pumkin, i think they are 4.1 ratio so all i will do is fit a lockright locker, and the rear i will fit a lockright or a minispool and do a disk brake upgrade, also fit some balistic fab diff covers.. and then spend the money i saved (not going solid diffs) on a 10.5:1 atlas to get my reduction for the 42's...