The relevant part is that XJ's still have a known weakness in the steering box area.
Fast forward from 2005, there are now a dozen manufacturers who make/sell XJ steering box area uni-rail reinforcement plates and the one's which have incorporated weld-in sleeves for the steering gear bolts are providing the total solution. Slapping on plates (welding them on is preferred ;>) ) will help reduce the potential of uni-rail cracking in this area, but without the addition of weld-in sleeves, they do not prevent the uni-rail from compressing and flexing when the steering gear bolts are tightened and/or torsional loads are applied to the area as the gear turns large tires.
Ok, enough nerding out.......back to bartering for Marc's XJ with tainted toast.