Product Details: With Expertise Built In™, the OTR Heavy Duty Shock Absorber offers specific engineering to respond to the demands of air spring and taper leaf suspensions of class 6-8 vehicles. This replacement shock absorber features a nitrogen gas charge, providing a quick response to harsh road conditions. Gain the shielded and comfortable ride for you and your rig with this critical OTR suspension component. OTR understands what it takes to repair and maintain Class 6-8 trucks, so they deliver solutions, making your job easier and more efficient. OTR warranties are comparable to or better than OE and top brands. All heavy duty truck parts offer the same form, function, and fit as the OE replacement parts. FleetPride is your First Click in Heavy Duty®.