b b end 20 connects to chassis attachment 18 in fig1 or 3 while rebound control shock absorber 10 is shown with elongated rod 19 and end 20 at the top in fig1 and 3 skilled artisans will understand that it can be inverted so that elongated rod 19 connects to chassis mount 18 a fluid displacement piston 22 is located on end 21 if rebound control shock absorber 10 is inverted not shown then attention to how coil rebound spring 11 carries the unsprung weight must be addressed again this is within the skill of artisans fluid displacement piston 22 is carried on the elongated rod 19 opposite its connection end 20 likewise a tube 23 is aligned along the axis b b and connects to the axle mount 17 when the end is connected to chassis attachment 18 or to tube 23 connects to chassis attachment 18 when the end 20 is connected to the axle mount 17 tube 23 has inside and outside cylindrical surfaces 24 and 25 inside cylindrical surface 24 is sized diametrically for surrounding the fluid displacement piston 22 for sliding sealing circumferential engagement there between with reciprocation along the axis b b a chamber 26 is defined by the inside cylindrical surface 24.