I'm hoping someone can tell me the difference between a 1996 six cylinder 231 transfercase and a 1997-2001 six cylinder 231 transfercase. I thought they were the same, but www.car-part.com has the 1996 231 six cylinder transfercase listed separately from the 1997 newer and 1995 older units. I want to purchase a 231 to transplant into a 1995 ZJ using a XJ AX15.