I have a 99 Limited, V8 with quadra drive.
In the mornings when I am backing out and then put the car in drive (after coming to a complete stop, even after a few seconds) there is a clunking, and a sort of lurch into drive.
Does anyone know what this is?

Another issue, and I don't know if this one even needs to be repaired is the drivers door seems to be sagging. When it opens there is a small drop and when it is closed it lifts up a little bit. The top corner of the door almost hits the top corner of the passenger door when it is closed. The dealership said that on the older ones the hinge pins can be replaced. But on my 99, it needs new hinges and I need to bring it to a body shop. - is this the case and has anyone else experienced the same door issue?

I Had a similar problem with my 99, however I had select trac. There was slop in the transfer case that caused the car to have a clunking going from reverse to drive and drive to reverse. Sometimes when I was on the highway and pushed on the gas the same clunking noise would happen when the engine caught up with the transfercase. I had a shop look at it and they said that I could have it replaced for about 2000, however the shop was owned by my buddy and he said that it's fine and not to worry about it as long as that was the only thing it was doing.

As for your door hinges it sounds like someone used to use the door as a cruch to get in and out. The only way to fix it may be to replace thoes hinges. Here is a websight that can help you do just about anything yourself. www.wjjeeps.com (http://www.wjjeeps.com). It's a amazing resource for the 99-2004 jeep series, or the wj series.

Good luck

It wouldn't hurt to have the universal joints checked. Sometimes that sound can be associated with them as well, does it also do it when going from park to drive or park to reverse? Simple way of checking the u-joints is park on level ground, block the wheels so it doesn't move and then crawl up and trry to move your driveshafts. If they move quite a bit then replace them. I would rebuild the transfer case instead of replacing it, a lot cheaper and not really to difficult for the do-it-yourselfer. $2000 is high when I know I could do it cheaper and in a few hours of my own time(with plenty of breaks and working slow).