The key to making the most out of an off-road truck's performance on the rough terrain favored by enthusiasts lies with suspension and chassis modifications. In order to cover rocky climbs, deep mud-holes, and other rugged obstacles, off-roaders modify the truck to give added ground clearance and increased articulation. The primary modification is lifting the vehicle and adding larger tires, with more serious off-roaders modifying the suspension to allow the wheels more travel, which keeps the tires on the ground and providing forward drive on the nastiest terrain. The best off-road articles from Four-Wheeler magazine are combined to createthis in-depth guide to maximizing off-road performance of your four-wheel-drive truck or SUV. The book covers lift kits, aftermarket suspension additions, articulation tricks, with a few drivetrain modifications (particularly locking differentials) added for good measure.