Do the WJ axles use the same type of ABS system as on an XJ?? If they use different tone rings, voltages or a single tone ring in the diff like some axles have I can't imagine you'll be able to make it compatible with the XJ computer.
Also, WJ axles are wider and doing the front-end steering and brake swap isn't exactly a straight forward and 'budget' modification.
I just ditched the ABS system on mine and have the C8.25 rear axle and WJ conversion on my D30, running 33's and planning to go 35+ when I can gather the 4.88s and other parts (going ARBs I think
) together.