2001 f350 shutters on take off then fine
 

okay, so I made another posting about getting this thing running. Finally did!
so, I got this thing running and decided to take it out for a test run. I put it in reverse and straight away started moving, in reverse. Put it in drive and it shuttered and slipped. once I got moving about 10mph it stopped. Also, I have an abs light on (replaced speed sensor and sprayed front sensors best I could) still there. I haven't taken this thing up to freeway speeds yet (haven't done paperwork yet after buying it).
it feels like it is low on transmission fluid, but I checked it while its was warm and it and looks full to me.. any suggestions?