Cylinder Assist Power Gearboxes, 1968-1993 GM 4WD with Crossover Performance Components PSC SteeringPerformance Steering Components is proud to introduce the ALL NEW SGX Series Power Steering Gearboxes for GM trucks and SUVs, two wheel and four wheel drive applications. Improved design features such as the largest piston assembly available delivers increased torque output and a 45MM sector shaft bearing prevent premature failure and provides smooth, reliable performance in all environments. Billet aluminum Top and End Covers resist corrosion and