GE wbxr2060v1ww is not agitating, and new coupler was installed already...

So, I have the GE wbxr2060v1ww. From the advice found on almost every site, I went ahead and replaced not only the coupler, but also the agitator itself. Still not working, I should have run a test wash with the agitator off as I found the shaft is not moving at all when it should be agitating. I suspect this to be a transmission problem. So 1: Does that sound right? 2: Is it worth it for me to try myself, and can it be done from the top side, or will I have to roll the thing over again (had to replace the drive belt a while back).

Edit: I did do a search, and the last reply with my model number was from 2005...

 

here's a link to your machine
http://www.searspartsdirect.com/part...v1ww&pop=flush
you can do it from the front. you take the tub assy out and turn over to remove trans. You have to take agit out first and I think there are dome bolts to remove from tub area.