I just put a used differential, transfer case, in my 2002 s10 4x4. I bought it certified to be working, and it seems to. The front drive shaft turns now but the front wheels don't turn. I know very little about these. Any advice. Thanks

 

There are a multitude of 4wd threads on the forum. You could start with the "4wd no worky" thread in the Tech Article (DIY) section. Read through a few of them and then see what questions you have about how things work.