Sorry if this has been covered. The left/driver side frame from the crossmember to the bumper is completely rusted, like gone. Steering gear box moves as much as the wheels. I am pretty sure I can change the whole sub frame, problem is where do I find one? Is there an aftermarket available?

 

I just went through this this past week; I had a welder come and weld new material in there, then I primed and painted it. It is covered in my "Engine Replacement Progress" thread, link below.
Engine Replacement Progress - DodgeForum.com