Try a visit to http://www.jeepfan.com/tech/jeeptech/transfer-cases-factory-np231.htm for some help - there were apparently two versions of the 231 as described in the reference - might be easier to check what type of tranny you have - info also available at that site. Hope this helps. <img src="/forums/images/graemlins/cheers.gif" alt="" />

Richard - 08 JK, 2.5" OME lift, nitrocharged shocks, Rugged Ridge front bumper with M8000 winch, JKS QDs - Olympic 221 rock sliders and rear rock crawler bumper, upper adj control arms f/r, JKS adj track bars f/r