justintime

I have a 90 with a discovery rear axle.The problem I have is the tyre sticks out of the passenger side 1 inch more than the drivers side ( this is clearly seen because I have tree sliders fitted) The trailing arms are the same length and the axle brackets are equally spaced on the axle. The a-frame ball joint pin, instead of sitting vertically, sits at an angle facing towards the passenger side. Is this what is affecting the allignment? If not what else could be causing this? Thanks