Comancheche

So I have looked all over to try to find this answer but can’t seem to have any luck. I have an 89 2.5l 4 speed 2wd that I’m thinking of switching to 4wd. Not a rock crawler just something to get around in bad weather. My question is what would I need to keep it 2.5 and the 4 speed and do the conversion? I know I’ll need a transfer case (np207?) front drive shaft. But what else? Thanks