Depends on how much you can get the axle for, but I don't think it's worth the effort unless you have a D30 with vacuum disconnect. Basically the Rubicon front axle is a low pinion D44 centersection that has axletubes that are Dana 30-size diameter and wall thickness, it also reuses D30 knuckles, brakes, and unit bearings. The axle also requires you have a source of compressed air if you want to run the OEM locker which operates with 5psi if I remember correctly. From your 88 XJ you might have a reverse rotation high pinion D30 which makes it something like 25-30% stronger than the LP D30 and probably almost as strong as a LP D44. If you have a HP D30 then a cheaper upgrade would be just to swap out your weaker 260X jointed shafts for some from a 97+ D30 with the larger 296X jointed shafts (same as D44), or you can go with some alloy shafts <img src="/forums/images/graemlins/kewl.gif" alt="" />.

Fred R.