Ripped the crossmember

[ironadict]

OK well my truck has been pulling some weird stuff on the freeway. Kind of swerves on its own and can be a little scetchy at times. So i had the best guy around align it, got new shocks and a stiffer bag up front. It rides better but still moves around on freeway.
Checking out my chassis I noticed the trailing arm Xmember is split on the bottom and pulled back. Must have caught a pothole or something when riding low. The bottom is pulled back so I know the frame rails must be pulled in on the bottom.
My first question is could this be the cause of my steering problem at higher speeds (55 and up)?
My second question is what crossmember do you recommend for replacement. PB or cpp or other? My exhaust has already been tucked up so I'm guessing it'll have to come down for it to be installed. I have a 2 piece drive shaft.
Third has anyone installed one without removing the cab?
Hope to order one of these soon and get this swerving prob out of the way.