sfbern

Hello everyone, this is my first post. I have a 2000 model 14.5 H/P 33" H/V with the differential drive chain either off or broke. I went up a hill at an angle and she locked up, when I try to push it one tire turns one direction and the other turns the other direction. I looked in the grease filler hole with a light and mirror and can see no chain, only gear teeth. Can anyone help me through removing/replacing the transmission case to see what I need to fix it? I know I can take it apart, I just want to be able to put it back together!                     Thanks in advance.  B. Ratliff