If that's the condition of the coupler, I'd investigate the front end parts closely before I'd worry about an alignment, it won't hold it if they are shot.
The coupler shoes are held by a pin inside, I'd pull it apart and check it for wear and any critters stuck in the grease then put a new seal and get the spring clip to hold the cap back on the coupler. I'll check or maybe some one will chime in with a link for it. much easier then trying to bend the tabs back to hold the seal. The guy who sells the clips is a member here.
Found it...
http://www.mopar4sale.com/index.htmEdit the coupler housing is held on the spline by a roll pin in the hole that you can see in the pic, it only comes out and goes in one way tap it out with a punch :
if it won't move turn the coupler 180* and try again.