That crossmember you linked should work fine. The tcase sits well behind the crossmember so it shouldn't matter whether you have a 231 or 242. When that matters is when you look at getting something like the TnT Customs belly pan which includes a tcase skid. The manual tranny crossmember will sit 1" lower (so will work like you have a tcase drop installed) than one made for an AW4, just fyi.
- 2001 WJ Laredo
4.0, d30/d35(for now) and 242
3" OME lift with JK Rubicon Moabs and 255/75/17 BFG MT's
- 1998 XJ Sport
Bone stock for now......