We retained the original Dana 300 because you can’t get or swap in a much better transfer case. All stock Dana 300s have a 23-spline input that matches the output shaft of the AX-15, and they share an identical six-bolt mounting pattern. The clocking on the AX-15 is different, however, so you’ll need a clocking ring to mate them together. We used an inexpensive adjustable clocking ring from Novak Enterprises. There are four possible positions from 0 to 27 degrees, while the factory Dana 300 clocking is somewhere around 23 degrees. We ended up positioning the transfer case at the 9 degree position. The clocking ring simply bolts on the front face with no other modifications needed.