some info on a 440

I have to wait to get a temp gauge to see how hot its getting. But for now I was looking to get my transmission going. We tried getting it going this weekend and it was really weird cause we would try to put it in neutral and it would reverse I'm gonna have to check the linkage but it drives low gear and reverse but won't drive in drive. Could this still be cause of low fluid also I was wondering how to set my kickdown linkage