Are not 76-78 axles longer than the rest? AFAIK the mini truck hub bodies are all the same length, solid axle or IFS. Maybe you need the silver faced hubs from a Pig?
Also the clip in the end of your axle on my truck is right up against the inner sleeve of the hub (what a PITA to get that on, I have to use a cheater bar). That seems to me to indicate the hub is too short, right?
'91 Pickup - Imelda
'08 Tacoma TRD
'09 Kawasaki KLR650
'12 Gunnar Rockhound 29
"To live is to suffer, to survive is to find some meaning in the suffering." -- Friedrich Nietzsche