I've got an 87 GT with stock suspension and I'm wondering what might fix what feels like lateral movement of the rear axle during cornering. It feels like the rear end sways to the side under cornering and if I quickly move the steering wheel back and forth at speed it feels like a slithering snake. I think the movement I'm feeling is in the rear but I'm not totally sure about that. I thought some urethane rear control arm bushings would help but then I've read that they can wreak havoc on the torque boxes, is that true? What about a panhard bar, would that help? Any help would be appreciated. Thanks!