I know this subject has been beat to death... but I am still confussed. I recently broke 2 TH350 transmissions drag racing. They broke in exactly the same place (bell housing) at the same speed. I was told that the TH350's are a liittle weak in the front . So I decided I am going to put in a 700R4 from a 87 to 93. I know about the cross member, cooling lines, electrical connects. What I am not sure is the torque convertor. I want the convertor to lock up to take advantage of lower RPM's. That means a new convertor ? and can I use my " Quick Silver" shifter ? Thanks