Agreed on the upscale versions having it. My buddy and I have near identical trucks but he has the towing package and he has the 242 while i`m still with the 231. :bawl:
The 242 was optional in the XJs with a 4.0L / AW4 combo until the end of production. The 242 was the base t-case in 4.0L ZJs from '94 and the 4.0L WJs.
HD 242s were available in the Durango and Hummer.
I mostly find the NP242s in those XJs with the 2WD/4x4 PART TIME/4x4 FULL TIME/N/4 LO shift bezels, and mostly NP231s in those XJs with the 2H/4H/N/4L shift bezels. Hope that helps.