If I'm not mistaken, the leaf springs attach to the axle housing differently also. From what I have seen the "true" '23 has a bolt running down through the spring into the axle housing mount, where the '24 has a pin running across the spring through a loop in the end of the spring. This difference in itself makes the two years not interchangeable. But be careful, some '23's have the '24 frames and some '24's have the '23 frames. So make sure of the correct year rear end first. The braking setup and the leaf spring hookup are what separates these two years. My apologies if I am mistaken in any of this and of course ready for someone to set me straight.