Intermittent steering shake

Hi guys my steering was very stiff and didn't self centre, iv removed the New TF damper and replaced the original and lubricated the UJs, and its helped alot, but now there's and shake in the steering at different speeds but it comes and goes during the whole journey, i have noticed the ps fluid is very dark and watery, it is moving about the bottle well could this be the issue,
Its had new steering linkage and arm. I had it on stands no play in the wheels, there is a slight judder of the wheel when turning the steering when on stands. Any info will be much appreciated

Im taking that all was fine, before you carried out the work on the steering ?

Hi not sure the vechile was delivered to my yard then was garaged prior to work, it had a new mot.

What is it, D1, D2. I dont know anything about the D1.

03 D2

Steering knuckle ball joints?

Has someone tightened up the steering box adjuster too much.... in so taking out its ability to return to centre.