

The medium-duty AX15 is a surprisingly strong five-speed overdrive gear box. It was introduced in Jeeps in 1989. It is used in XJ Cherokees and MJ Trucks with the six-cylinder. Its only year in the ZJ Grand Cherokee was 1993, and only with the six-cylinder. It was also the transmission of choice in the 1988(mid-year)-1999 YJ and TJ Wranglers. The AX15 is also found in Dakota trucks.
No adapter is needed for the 23 spline output AX15/NV3550 to the STaK Monster Box.