These Bilstein shocks were supposed to replace some worn out Rancho rear shocks on my 1988 4-Runner. The new Rancho shocks were rough/stiff. I've had Bilsteins up front and they were still going strong. The Bilstein rear wheels were not present when I last changed the shock absorbers. This time I installed Bilstein shock absorbers and am very happy with them. Such an improvement in driving both on and off-road. I read somewhere that Bilstein shocks last longer. It is true.