Constant rate shock and coil springs, economical solution for heavier duty use improve stability and maintain ride height Carrier shocks seamless lubricating fluid and gas reduces excessive friction against the piston rod to help reduce premature wear while heavy-duty nitrocarburized rod delivers long life Super-finished, chrome, plated piston rods provide corrosion resistance, more consistent wear surfaces, proper seal lubrication and longer product life Great for occasionally hauling or towing varying loads, heavy gauge, calibrated coil spring reduces sag when loaded up to 1,200 lbs. [Not to exceed vehicle GVWR (Gross Vehicle Weight Rating). Product does not increase payload.] Generally compatible with: 1994-2001 Dodge Ram 1500 4WD, 1994-2002 Dodge Ram 2500 4WD