Sounds like transfer box. Take props off then jack up each axle and try turning them, and run transfer with no props on. Should be able to pin point it that way.
From your description I'm saying the R&P.
I would say that you twisted the tube when you ripped the control arm mount off, because the upper and lower arms are what hold it in the correct position / camber. Fitting the strong shafts probably led to the R&P damage rather than a bust UJ - BUT maybe you'd have had several bust UJs without the uprated shafts, who knows.Sounds like an adjustment of driving style or fullsize axles (Dana 60, Ford 9"/D60 hybrid, Patrol axles...). Dana 44 front axle will need uprated shafts and uprated mounts/truss to survive what you've done to that XJ D30 - the shafts and UJs are the same size and the mounts probably very similar.
This will be in the Birty archives from not too far back but on e-bay was a guy selling axles from his CJ7 both were Dana60's and had ARBs and 4.88s and were cut to CJ YJ TJ width. not cheap but he had them made for him.....I saw them under the vehicle when I went to look at a Dodge Dana 60............ He's getting out of 4x4 and breaking is his only option.Has a set of swamper 38s for sale to suit as well................Not very good at digging things out of the archive ................ some one will be along soon doubtless.Might save you over the next few years.................. will mean you have to run Dana300 TC tho
Might save you over the next few years.................. will mean you have to run Dana300 TC tho