I have an 87 that I converted from the peugot to an AX 15 out of a 97 TJ. The peugot is easily identifiable by looking at the main case of the trans. It has a seam that runs straight down the bottom side of the trans with bolts that hold it together. The trans case will actually split in half if these bolts are removed.
As far as the 96XJ trans, the AX15 is the same, the "clocking ring" that you are talking about is built right into the T-case. Its on the input side of the T-case, there is a series of bolts around the input housing that you remove and re-clock the T-case up 2 bolt holes on the driver's side so its the same as the YJ. The XJ has it clocked down on the driver's side in order to align the driveshaft better going to the front axle. Because the front axle on an XJ isn't the high pinion front end.
Try googling re-clocking an NP231 or search youtube for a video on it.
Hope this helps.
'87 YJ, 4.2L built and bored, 8.5" of lift, 8.8 rear, AX15/NP 231, Tom Woods drive shafts, Flat fenders, 12,000LB winch, Custom bumpers, Rattle can paint job. Never completed...