[RC-Monster Mike]

If you get a hard pull it is could be a couple things. A nice tight servo saver would be the first place to look, along with the attached servo horn and linkages. Excessive play in the linkages could also contribute to this effect. Likewise, the linkages should be properly adjusted - left and right side should be attached in the same positions on either side and be the same length, for example. A common thing to do with Maxx trucks used to be putting the steering linkage on the top of the steering knuckle/pivot block rather than the bottom, which results in massive bump-steer. Diff setup can also contribute - if you have too heavy a diff oil or a locked diff, this will not allow the left and right side to spin at different rpms, which is progressively more important under power or at high speed, as no two RC tires are likely to be EXACTLY the same diameter and therefore must spin at slightly different rpms to drive straight. Usually the "pull" is caused by a loose or improperly adjusted linkage or steering component, though. :)