By now you know there are differences in the 2003 and up 48RE drive hub. It is one diameter the length of the entire hub in order to accommodate the sealing ring on the stator shaft. Some TC builders are interchanging the hubs with limited success. Whether you are using the late or early hub is up to you. We recommend to use the correct hub for the correct model.
However, please keep in mind that you will need to instruct you customer which hub you are using because if they leave the sealing ring on the shaft with the early design there is a good change there will be some type of TC or pump failure.
– Found in November 2007 Newsletter