I used my axles out of my 8 3/4 that were 35 spline. I narrowed the Dana 1" shorter than the 8 3/4. That placed the one axle flush with the inside of the spool splines. The other axle had enough spline to slide deeper into the spool (the end hung inside the spool). Ran it that way 10 years. it's still in the car today.
Doug