The 700R automatic transmission adapter to the Jeep New Process 231 is 1.50” in length. The adapter material is 356 T6 heat treated aluminum alloy and has a provision for a transmission mount. 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 adapter assembly will fit the Jeep NP231 transfer case with a 23 spline input shaft. 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, 242, 247, 249, and 2410 Rock-Trac transfer cases.
This kit is designed for exclusive use with the 700R-4 / 4L60 / 4L60E. The overall case length of the transmission is 23.375”, has non-removable bell housing, and a 4 bolt square rear case. Late model 4L60E automatics will have removable bell housing and a 6 bolt hex pattern rear case.