Ultima | Rear Shock Absorber | Heavy Duty Gas Twin Tube Leaf Spring Applications | Universal | 400070Ultima Rear Shock Absorber (Single) Heavy Duty 400 Series The Ultima 400070 is a robust, Heavy Duty (HD), Gas Charged Twin Tube Rear Shock Absorber from the Ultima 400 Series. It is specifically designed to fit various vehicles with rear leaf spring suspension (such as older model utility vehicles and commercial vans) that require a shock with these specific dimensions and mounting types. This shock prioritizes durability and consistent damping under