Update to my original post. Firstly they are single not dual action. So I pulled off the front, they were nearly dry with no resistance in either direction. Filled them with hydraulic oil and they recovered very well, free travel upwards and stiff resistance in the rebound direction. So excited, this has been my truck since the age of 15, some 46 years now. Thinking these shocks were likely not functioning all these years, I expected to feel the difference on my first bumpy road test. But, to my disappointment, any difference was almost unnoticeable. Did these shocks ever make a difference when new?
