The superior instruction are least clear about the "k1 & k2 accumulator control valve springs". From the included instructions it is not clear which of the included springs requiring dropping the valve body, and which can be done with valve body in place. They recommend dropping the valve body for everything. Even so, their instructions are not very clear as to where exactly the "control valve" springs are located. From the sketches it's pretty well marked where the K1 & K2 accumulator springs go (which is all that I replaced).

Can anyone explain what exactly the control valves do, and how the superior kit springs change things? I didn't bother dropping the valve body to try to change those after reading many posts about others who also didn't bother and found that just changing the accumulator K1 & K2 springs did the trick. It seems to have worked for me as well, but it's still nagging at me that maybe I should have dropped the valve body and switched those control valve springs too.