i just wanted to here something about taping the box .the problem thet i have is i put a sag. pump with a fj60 box on my zook and it works great in 2wd but when i put in 4lw and start turning in tight places it starts pukeing up fluid through the filler cap like there is to much fluid in it.i thought it was over heating so i put a cooler and about 5 ft of steel lines on it but it still does it .it acts like it is not circulating .i have landcruiser axels and 38 inch tsls you would think that it would be strong enough to turn that.
i ran 38s and now 42s, with a similar setup, locked front, difficult to steer, very difficult
i would say jack the car up, cycle the steering from side to sode, to try and bleed the system, sounds like you have airpockets
hows your cooling lines? are they above the top height of the reservoir at all? is your pump below the line of the steering box? many factors to look at! hell the guy you bought your axles off ran the same shiat on a heavier rig, so somehting is WRONG!
drilling and tapping the box:
search for "drilled and tapped fj60 box for hydro"
try ram assist (landcruiser section)