Shock and vibration are part of what makes prop pullers work. Most even have a flattened spot on the tool that is a "hammering pad", if you will. They are designed to be beat on. Of course you don't bang on the prop or shaft themselves. I'd wager that I've pulled more props than anybody else on this board, all of them using the technique I've described. Never damaged anything doing it, transmissions included.
It is a rare prop that just comes right off when you apply the puller, as the OP is discovering.
Last edited by Fstbttms; 04-15-2009 at 10:37 AM.