Countershaft Removal Problem

This is my 3rd 833 I'm rebuilding, first on was out of a 1968 Barracuda, and I had to press that countershaft out, 2nd one was a OD one with a cast iron case, that countershaft I was able to push out by hand. The 3rd one is a OD one with an aluminum case, I thought it would be like the second one and i would be able to push the countershaft out by hand, but its not budging. How do I get it out?