Sorry if this is in the wrong forum but I wasn't sure where else to post.

We have a 2005 300C that we are in the process of installing a 3.91 Getrag center section in with new axles and hubs. What kind of tuning problems am I going to run into once this is on the road and do any of the box tuners have the capabilities to make the needed changes for the ECU and trans controller to work correctly with this change?

Thanks!