Introduced in 1988, the Jeep NP231 is a part-time transfer case became the standard for XJ and YJ models.
The adapter material is 356 T6 heat treated aluminum alloy and has a provision for a transmission mount.50 in length;Material is 356 T6 heat treated aluminum alloy and has a provision for a transmission mount;Kit includes an adapter housing, new 23 spline 700R4 output shaft, bearing, snap rings, o-ring, seal, gasket, fastening hardware and adapter instructions;California Residents: WARNING Chain driven with a 2.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.