Driveshaft Center Support Bearing?????

[BuckB78GMC]

So, I realized the hard way that my 78 GMC 2WD has a two piece driveshaft. The center support bearing assembly is pretty much toast and is causing a HUGE wogbble when going down the road at anything over 35 mph. So I was under the truck looking at this thing and it looked easy enough to replace. I went to my local Autozone and bought the bearing that their computer says was the right one. As I started taking this thing apart I'm not so sure that the one I bought is the right one. Of course when I entered the infomation about my truck into their online system, I got like a half dozen different part numbers. My local store only had one in stock though so I snagged it. So, what is the secret to getting this thing off of the driveshaft shaft. Is it just pressed on like any other bearing? I gave the old bearing a couple of good strong wacks with a BFH and so far, it's not budging. I don't want to ruin my driveshaft. the rubber on this thing pretty much disintegrated so know I'm down to just the bearing itself left on the driveshaft. Any help with this project would be much appreciated. Thanks. Buck.