Just to recap, last week I got some good tech. support here and discovered the gears in my rear end (12 bolt) were in a thousand pieces. I changed those gears (spiders, and associated) with great anticipation of getting my truck going again. I got everything together, added fluids, and went for a drive. I didn't get a quarter mile before I heard something break, I went back to the house and looked under the truck: the front driveshaft to diff. u-joint had broken and the driveshaft was flopping around. I unbolted the front shaft from the flange and drove it again. This time I never even got off of my road, something else kinda popped and I lost power to the wheels. Any gear, any range. Not really knowing what to do, I got a new u-joint and hardware and re-installed the front shaft. (I don't know why I thought this would work but at the time it made sense). Now the truck still won't move. I have two questions come to mind. First, when I reinstalled both driveshafts during the week, my allignment marks had rubbed off, so niether shaft is probably in the way it came out. Second, when my front u-joint broke, could I have broken the chain in my NP203? I'm still trying to learn about the truck and have only had it a couple years. It's never been my daily driver, but I would like it to be. It needs a lot of attention. It's been neglected over it's 25 year life and I want to fix it right. Sorry so long, I always do that. Hope you may have some advise. Thanks.