I just got my copy of Classic Motorsports magazine, and there is an article on improving the handling of the TR3. They talk about camber and caster changes. The part on the camber change is easy enough to visualize. They use TR6 upper A-Arms and slot the holes for the ball joint mounting so that the verticle link can tilt inward for negative camber. But, then they talk about giving the suspension some caster. They don't mention the TR4 3 deg. caster trunnions. They use the Jag XJ-6 ball joint as it is .150" narrower then the TR6 joint. They put shims between the Jag joint and the front of the upper A-Arm to move the joint rearward. I understand this. What I don't understand is how is the vertical link going to tilt backwards when the pins on the trunnion that go through the lower A-Arms are fixed. How is that whole trunnion and vertical link are able to tilt backwards??? Am I missing something here?? They said that they were able to get 7.5 deg of positive caster by doing this.