Thanks for the reply Dru, it's definitely the uni-joint on the front driveshaft, (transfer case to the front axle), it's broken enough that even a mechanical potato like myself can confirm [moves in/out, metal shavings hanging out of it, clunks, etc].
I spoke with Jeep Konnection who do lots of AEV suspension lifts and whenever they swap out the driveshaft they replace it with the Tom Woods unit so i'm more comfortable going down that route and have ordered a replacement, the notes on the Tom Woods and other sites in regards to pinion angle (adjustable upper control arms) being critical for smooth operation might be less applicable in this scenario.
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