The problem is that the 7060 ECM code doesn't seem to support a 4l60E. At least none of the BCC's are for a 60e. If you are good at programming, you might make it work. It would probably be easier to run an ECM capable of running $0D or $0E code (7427) or just fixing the 4l80E (the 4L60 probably won't last behind the 454 anyways).