Help with steering problem

[Harddrivinman]

Hey guys.... I have a 1990 gas motor suburban body. On an 86 diesel chassis. The truck has a 1994 good wrench crate 6.2 with a banks kit. Color red. Interior tan. I was driving one day and with out notice the steering wheel felt for a moment to not be connected to the wheels. So for example. Now. Later on after I have replaced everything. Pump hoses gear box and hydro unit. I pull out of my driveway. Turn right. And the wheels turn further to the right than the steering wheel has been turned...... I correct back to the left and again the tires jump further than the wheel is turned. When correcting the steering wheel feels slightly hard to turn only for a moment the. Then suddenly the tires have go e twice as far to the one side as i have turned the wheel. almost putting me in the other lane of oncoming traffic..... Sometimes the steering wheel feels slightly harder to turn then the wheels jump to one side and the steering wheel feels like its not even connected to anything.... Like I said earlier. The gear box was replaced first when the problem first happened. That fixed the problem..... For a few weeks.... Then. It started again. Out of no where. Changed the box again.... Fixed for a few weeks then happened again..... Wtf. So now I get a new hydroboost unit. Changed and did not fix the problem. Now I have a new problem on top of the already existing loss of steering problem. I go to bleed the hydro unit. And with the key on and front axle off the ground. I can't turn the steering wheel. If I crank on it fluid spits out of the pump resevior. The resevior is divorced from the pump. Way up high. With a hose connecting down to the pump. So.... I have steering while engine is running and driving but not when it it shut off. Can't turn the wheel. At all. The brakes work perfect. I did a disc conversion in the rear with a full float 14 bolt. And a disc disc master cylinder. My next step is I have no f...... Idea. Wheel bearings are tight steering damper is new. Ball joints are new. Tie rods are new. Front end is 100% any ideas or comments will help. Thank you.
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