The rack and piņon system frequently gets out of timing side to side but the nature of the rack and pinion makes top to bottom offset less frequent and more difficult to correct. Normally the h channel holding the piņons will need to be removed from the side of the coach and reset to align with the correct position on the rack. A few things to check to see if the gears have jumped locations. Put slide part way out and measure distance on all four tracks. These should all be the same, if the top are smaller than the bottoms then you probably have jumped a few teeth. Pull back the seals around the h channel on the side wall and be sure the screws are not broken and the slide is sitting evenly in the cutout. Look closely at the gear mechanism where the piņons meet the rack. Make sure the thrust blocks are secure and not loose. Inspect the bottom of the slide. There should be roller under there. Make sure they are there. Also make sure there is no damage to the underside of the slide.
Paul and Debbie