Howdy Ron nice of you to stop by, I have $170 into 3 different cases your right and wrong this was a 89 six cylinder tcase. The main input shaft for the 89 was 23 spline bearing was thiner and the input shafts have a shoulder inside that is tall so its not just the number of splines it is also shoulder tall or short and the 1989 main shaft is much shorter than 1996 242 anyway a good lesson learned and hopfully someone else can learn from this 2 day feaskle of mine, I love to wrench but this was one of those holly ---- what next episodes that no one enjoys. Just listen here mister I will be asking your advise in the future so do me a favor and pass some of this info along it has to help somewhere I want to get back to my hot rod 1973 dart swinger. Doug