doing rack & pinion is involved , if you go rear steer as per factory you have oil pan clearance issues so the rack needs to sit lower , if you go to front steer the you need a different spindle & I have yet to find a good one , in both cases generally you need to go to a tubular K frame as well unless you make some strong brackets off the factory K for rear steer, you will also need to modify the steering column to get enough flex to get to a rear or front steer rack