Nothing like the joys of owning a four wheel drive. I am so glad that my son has went through that stage. I don't think that there is apart on his Ranger that we have not fixed or replaced including body parts. When he had his 86 Bronco it was front axle u joints ,drive shafts. He always managed to break something. Be lucky you do not have to deal with rusted on parts. Heat wrench and WD-40 or such are the order of the day. I would take it to a good frame shop and let them fix that cross member. Where you live there should some good ones that do four wheel drives all the time. Those rivets are not that easy to get out. Plus you will have to make sure everything stays in line when you take it out. Good luck.