The above image was recently posted up over on RC10Talk - this shows two different types of transmission halves - on the Left is a CAT housing (without the loop for the ProCat's tensioner bar) on the right is a ProCat housing with the 'loop' - as you can see different bearings are used... Ironically my ProCat uses a housing which uses the flanged bearing - but has the tension bar loop! However as far as I know, you can fit a later diff in an early housing & visa-versa.... I just wonder what bearings you are using??
I have just checked my car & there is pretty much zero 'float' for the diff between the housing halves
