Usually, Jeep XJ, TJ, and YJ 4 cylinder 231 t-cases have 21 spline inputs to match the AX-5 manual transmission. Six cylinder and 4 cylinders with automatics have 23 spline inputs, the only exception is the earlier models with a 4.0l and the AW-4 or BA 10/5 Peugoet transmissions. There are a couple different input lengths, too. As sunder said, the inputs are easily swapped.