Hello , Can the castor angle be adjusted on a stock 2000 mod 100HD ,4,2 TD ? I seem to remember it can . Are there shims involved (don't rememeber seeing that) or how is it done ? Or the top 2 excenter bolts ? I'm going to have the frontend alined and want to make sure they get it right. I'm to lazy to go jack the LC up and have a look. Thanks for any insight on the matter!