The thread's gettin' kind of far down. You might want to post the question as a new thread up at the top to generate some more response.
In the meantime, I hope somebody will jump in and say so if this is a bad idea, but I'd think heating the new gears in an oven set at about 200-250 will reduce any pounding you might have to do and might even allow you to drop the gear right on over the shaft and key, and have it shrink back to a good fit as it cools. That's the trick with flywheel ring gears. My only reservation is that the ring gears get used hard but only intermittently. The timing gears are better lubed but work longer at higher temps, and I don't know whether heating them to that kind of temperature would have an adverse effect on their tempering or not. I tend to doubt it, as they're regularly bathed in oil that approaches the lower end of tht temp range. Still, if that might be a problem, I shouldn't think a machine shop wouldn't charge much for pressing gears off and new ones on. If they knew you were coming, it's a quick job that they could do while you wait. I'd think that would be preferable to anything more than the mildest hammering, as anything like walloping it might damage or distort your thrust bearing/limiting surfaces.
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