Did you top off the tranny fluid after you replaced the servo?
here is another possibility
http://www.automotiveforums.com/vbul...ghlight=cables
QUOTE:
just reading this post dont change the tranny
first thing to do replace the filter then get the thing flushed. next disconnect both battery terminals touche the two together for 15 seconds reconnect both of them problem should be gone
if it does come back all you need to replace is the torque convertor