Muncie 3 speed pin removal?

[Craven93]

I'm tearing down my Muncie 3 speed out of a 1972 c10. I believe it's a 330. I'm replacing the extension bushing and all the gaskets. I'm trying to remove the reverse ideler shaft so I can move the reverse ideler gear out of the way. The manual says to drive the reverse ideler shaft and key out of case with a brass drift. However there is hardly any room inside the transmission to get a punch or hammer in there. Does anyone have experience removing this pin? Any help is appreciated...

Thanks!