For those of you with the factory Bilsteins, if you look at the top of the shock and it has a retaining clip holding it together, those can be rebuilt by Bilstein and the shock characteristics can be modified to suit your application. I just dropped my shocks off yesterday at a Bilstein warehouse location to have them tested to see what shape their in after 15 years, but only 16k miles. At that point, I will try some different settings to see if I can smooth out the rear of my truck.