Hey guys, new to the forum :wavey:. I have a '97 TJ in great shape, other than the frame. I live in VA and although we don't see as much salt as you guys up north, between the little that we get and the PO's lack of up keep, my frame is starting to rust. It isn't bad, and is really only in the holes at the rear control arm mounts. I could probably patch it, but I came upon a mint frame from an '03 on the cheap. Problem is it is a 4 cyl. frame and my heep is a 6 cyl. with an auto. Now I know the motor mounts are different, but what else is? I have heard things about the crossmember and belly pan are different. Is this true?? What kind of trouble am I looking at??