The adapter assembly will fit the Jeep NP231 transfer case. Introduced in 1988, the Jeep NP231 is a part-time transfer case became the standard for XJ and YJ models. It was also used in six cylinder ZJ models through 1995. Chain driven with a 2.72:1 low range, it’s reliable even with more than stock horsepower applied.
The Advance Adapter kit is designed to fit Jeep New Process 231 only