Yesterday my 2005, Trailblazer LS, 4.2, 2WD transmission blew all the fluid out and will not move. Had her towed in the rain and not had an opportunity yet to look underneath. My son told me that if the front seal is blown which would let all the fluid out that it is a good possibility that only the torque converter is bad. I did experience slight transmission shuddering for a week or two prior to this at speeds of app. 45 to 60mph. Any help here? I otherwise would have to buy a used tranny due to cost and if that is so, any source recommendations?