I built my New frog today and noticed the following differences. Dog Bones and Cups:   As we all know by now the dog bones no longer have the hex shaft but a more adnvaced pin design found on modern race buggies.   The cups that go on the gear box have a solid pin on the drivers side, the original you had to slide the pin through the cup. Shocks:   Again we have all seen the new shocks. They are a better design but I might still try and get a vintage set.