Monroe 37133 OESpectrum Truck Shock Absorbers All Weather Fluid: Contains special modifiers to reduce friction and ensure smooth rod reaction Full Displaced Valving: Valving automatically adjusts to road extremes to provide consistency and ride comfort Upper Mounting Code:Stem Mount - 2.3/8" Stem Length X 3/8"-16 Thread Pitch, Lower Mounting Code:Loop Bushing&amp; Sleeve Mount - 1/2" Sleeve ID X 1.5/8" Sleeve OAL Fluon Banded Piston: Works with the existing groove tube technology to provide responsiveness to changing road conditions Unique Groove Tube - PSD: Precision tapered grooves in the pressure tube perform like an additional stage of valving for optimum light truck ride tuning All Weather Fluid: Contains special modifiers to reduce friction and ensure smooth rod reaction Full Displaced Valving: Valving automatically adjusts to road extremes to provide consistency and ride comfort 1-3/8" Bore: Larger bore than most shocks to provide more efficient and consistent control Fluon Banded Piston: Works with the existing groove tube technology to provide responsiveness to changing road conditions Unique Groove Tube - PSD: Precision tapered grooves in the pressure tube perform like an additional stage of valving for optimum light truck ride tuning