Front End Floats

Rookie question, as I am not tech savvy on front end parts. Does the higher caster # move the wheels back, causing the rub issue?

 

Forward

 

my understanding is that an aftermarket UCA with 2 degree of caster (keeping the LCA constant) will move (rotate) the wheel backwards towards the rear of the fender.
my guess is the LCA positive caster adjustment will move the wheel forward in the fender.

prior to my UCAs my wheel was rubbing the front of my fender as I turned sharp. I got the DK UCAs and side by side with OEM you can clearly see the ball joint moved backwards, increasing the caster angle ... I think of it as angling the spindle or rotating the wheel on the center axis, pushing the wheel back. so adjusting from the top (UCA) will push the wheel back and adjusting from the bottom (LCA) will push it forward.

 

Yes. The upper ball joint is moved backward. Caster is a vertical line that tilts forward and back. So as the top moves back the bottom moves forward. Thus the bottom back edge of the tire which rubs moves forward. Positive caster is when the top of the line moves back and the bottom moves forward. Hence the need for more positive caster.

 

Also. By adding a uca with 2* positive caster you automatically get 2* on the bottom. Then there is approximately 2.8* of adjustability with the bottom caster adjustment minus what is lost caused by the lift. Ie. I have jba ucas and run 4.2* caster.