I got a 70 Mach 1 with a 351w. I decided to tear the car apart for a winter project. Pulled the motor and tranny, fixed up front suspension, painted the firewall and clean everything up. Reinstalled motor and tranny and now I have a weird bad vibration in the motor. While sitting at idle the whole car shakes. I did not remove the balancer on the motor and did no internal work to it or the tranny. I had the motor and tranny separated and was wondering if when putting them back together I did somthing wrong. The flywheel only bolts up one way. Does the torque converter have to go in any special way? There was no bad vibrations in the car before I took it all apart. The motor runs great just like it did last fall.