I'm an absolute genius. I can look at alternators and tell the output. Actually, I've worked part time at a friends alternator shop for forty years. Look at the pictures of these cases. Mopar changed to a heavier casting with thicker cooling fins, added ground lug, and beefed up bearing support. Also look at the gap between the case halves in his picture. It has a 1/4 inch gap and the older ones had about a 1/2 inch. I don't know for sure what the claimed rating was, but I've been told it was 73 amps. We've run them on a "real" tester with a load bank and seen close to 80 amps. The testers in the auto parts stores aren't capable of testing one under load. It takes a tester with a 5 horse motor to really load test one.