Hey Dave, glad everything's fitting up for you. Unfortunately, to pull that drive gear back to where you need it, the tail housing needs to be off the trans. That's why I mentioned having your trans guy do it when he swapped the tail. Oh well, back under the car again. Probably best to take the trans to him, you need a long puller to pull the gear back on the shaft. As 409gasser said, easy job (once the trans is out and the tail housing is off). Good luck, it'll all be worth it once you're driving it.
Jim