MONGO...SO if my Jeep sounds like it has a bunch of tin scraps bouncing around in it, and no 4wd, do you have an educated guess on what exactly might be wrong? Thanks, I appreciate your help...
No 4WD? Do you mean if you throw the 4LOW shift lever, it will NOT shift into 4LOW and instead you get a "Service 4WD" message?
So you're getting these mechanical noises from what you suspect is from your XFR Case?
Have you drained your XFR case through a strainer to see if there is metal in it?
What little you've told us, the XFR case has mechanically failed. If that is true:
Converting it to RWD only, by removing drive shafts, will NOT work and to get it to work will cost more than just replacing the XFR Case with a new one.
The XFR case is going to need to be replaced.
I would definitely do some troubleshooting and diagnosing and NOT jump to conclusions. The CV shaft or U-joints to the driveshafts going to the XFR case could be bad and making these noises, and you've misidentified them.
If the XFR case is sounding like its grind rocks inside it, and it is the XFR Case making the noise, there will be metal in fluid as you drain it. CV shafts and u-joints can sound like they are grinding rocks as well. Cheaper and easier to replace. (although the rear driveshaft does NOT have serviceable u-joints, you have to replace the entire driveshaft). Even bad wheel bearings, not so uncommon on the Commander could be making these noises.
As well, the "Service 4WD" message can come up for perfectly good XFR case because of bad software loaded from a recall. The latest updated software fixes the erroneous misidentification and disabling of a bad XFR Case that is actually good.