Running lockers, big axles, and 40s on your JK? Your factory steering isn’t going to cut it. PSC’s BIG BORE XD Cylinder Assist Steering Kit is the ultimate upgrade for Jeep JK/JKU owners who demand serious steering performance. Designed for rigs with locking differentials, aftermarket axles, and tires up to 44", this kit delivers the torque and control you need on the toughest trails. This complete system includes our BIG BORE XD Steering Gear, a high-performance pump kit with remote reservoir, a Cylinder Assist kit, and all the hardware you need for a clean install. Say goodbye to steering play, pump overheating, and white-knuckle turns when your lockers are engaged.