On my 02 Caravan the transmission has started jerking or clunking when downshifting, seems to be when going into second gear. Any thoughts on how serious this might be? I had a leak so dumped in some stop leak and this is when I noticed it. Now I had the transmission flushed with a good cleaner and a new filter put in and it is the same. Any thoughts what might be going on here, really don't want to put any money into this van. thanks