tearing up the yard

[shelby987]

got home from work yesterday, and got my first chance to wheel my 70 4x4....I was very impressed, the 250 put up quite a fight while two tracking through the 10 inches of packed snow in the back yard....now I need tires that aren't smooth as a baby's butt, and maybe I can have some fun in the mud in a couple of months.
did find that the transfer case is not fond of 4lo.....i pushed the stick up as far as I could, then it slid back a little and ground when I gave it gas...if I held it in 4lo as far forward as it would go, sometimes it would catch and stay, but the first couple of times it wouldn't have it.....am I looking at linkage, fluid, or syncros?
Think 70 was a dana 20....but I could be wrong, it might be a np205, its bolted to what I believe is a saginaw 3 spd.
Anyone else use these old 4x4's as daily drivers with fun in the snow/mud rigs....or is it just me? (although, I have a backup vehicle, if this one takes a mound a little too hard)