OK. In all my yrs Ive never come across a cracked flex-plate, in a running engine. I will try to remember that. But I guess at my age(61& semi-retired) I probably never will. Still its good to know.
Chebbies used to do it all the time,, only with the way the bottom dustcover exposes the bottom of the converter,, you can take out the converter/flywheel bolts, and all the bellhousing bolts, replacing the bottom 2 each side with bolts 3 to 4 inches long,, remove the rear trans/crossmember bolts, nuthin else,, and slide the trans back on the bolts,, and have sufficient space to get a wrench and hands up to undo and R&R the flexplate/ring-gear..
hope it helps, if you ever have to do a Chebbie... I can't remember doin a Mopar that way,, but I sure would try..