Compatible with GM HD trucks with 4 Compatible with GM HD trucks with 45 inches of rear lift; Two Twostage sealing system to keep dirt out and oil in; 5/8" hard chrome plated shaft; Compatible with GM HD trucks with 45 inches of rear lift; Designed for use on leveled and mild lifted vehicles; Developed for use with larger oversized wheels and tires; Eliminates cavitation; Made in the USA; Nitrogen charged internal chamber; Rebuildable and revalvable; Sold individually; Twostage sealing system to keep dirt out and oil in