Anyone know about driveshafts?

I know this may not be the right place to start but i figured a bunch of car guys might be able to help me out here. I replaced my transfer case encoder motor on my 2004 suburban 2500. While i had the front driveshaft off, i ended up needing to put the transmission from park into neutral so i could reposition the transfer case to neutral manually from underneath the truck to install the new part. Me being forgetful, i reinstalled everything, lined the driveshaft back up to the marks i made and then got back in the truck and shifted back to park... the question i have is did i just fuck up by doing that? Obviously the shifting linkage is tied into the transfer case or else i would have been able to freely turn the transfer to neutral by hand while the truck was in park. So now im thinking i fucked up and my driveshaft is not properly reinstalled. I also rotated the shaft by hand a bit while i was under it so i have no idea how to get everything lined back up. Any ideas on this or did is it not something i need to worry about?

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I would take it apart, reinstall, drive it and test 4wd. If it works and doesn't make any noises or vibrations, awesome.

Ill give that a go. Im assuming since i already screwd up alignment last time, theres no real point in marking the shaft again except maybe the yoke up at the trans.

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Well something is screwed. Started the truck, runs fine, put it in gear, wont move. Shift to park and get a terrible buzzing or high speed grinding from the transfer case area. If i go back to any other other gear it stops and the motor runs fine but there is a little bit of a whirring noise in reverse. But like i said, no connection to the wheels at all. Something is either broke or way off in the transfer case i guess. Still have the service 4x4 message and red neutral light on dash switch.

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