HOUSING REAR EXTENSION NP231 Fits: Jeep Cherokee / Comanche (1987-1996) with NP-242 Transfer Case. Jeep Grand Cherokee (1993-1998) with NP-242 Transfer Case. Jeep Wrangler (1987-1995) with NP-231 Transfer Case. Jeep Cherokee (1991-1996) with NP-231 Transfer Case. Jeep Grand Cherokee (1993-1995) with NP-231 Transfer Case. Jeep Liberty (2002) with NP-231 Transfer Case.