Introduced in 1988, the Jeep NP231 is a part-time transfer case became the standard for XJ and YJ models.
in length.Transfer CaseThe adapter assembly will fit the Jeep NP231 transfer case with a 23 spline input shaft.The adapter kit includes an adapter housing, new 23 spline 700R4 output shaft, bearing, snap rings, o-ring, seal, gasket, fastening hardware and adapter instructions.The Advance Adapter kit is designed to fit Jeep New Process 231, 242, 247, 249, and 2410 Rock-Trac transfer cases.