Outer Limits 4x4 Board

I might be on to a couple of 5 speed g'boxes and a disk brake front end for my cruiser (47 series) , just wondering how to tell where the g'boxes come out of and same with the front end? Is there a length difference on the boxes and the front diffs?

hi
im not shore about the gear box but as for the front disc brakes hilux and landcruiser all hae the same swivel hubs so it shouldnt matter what the front end is out of the hubs will bolt on(as long a its solid front axel hilux/cruiser)