High Gas Pressure Design: Nitrogen-infused 46mm monotube design with a floating dividing piston separating the gas and oil, provides consistent and fade-free performance. Digressive Valving: Bilstein’s patented digressive valving allows shock absorbers to instantly react to changing surface conditions; Giving you a stable, controlled, and comfortable ride. Stock Height Replacement: The 4600 is tuned for your vehicle; No matter whether youre working down a gravel road, towing a trailer, or taking the family out; You can expect a safer driving experience with less fatigue on those long hauls. Warranty: Bilstein’s 4600 series shocks are backed by Bilstein’s limited lifetime warranty, ensuring their products are free from defects in design, materials, and workmanship. Direct Fit: Tuned for each specific application to ensure optimal performance is achieved these 4600 series shocks fit 1969-1974 Blazer RWD.