Joshua did say that I need new rear differential bushings as he wiggled the differential which then caused the driveshaft to wiggle. Can anyone confirm that the picture where the silver part that is circled red is in fact the rear differential? The other two photo's are the parts he said to replace. What are those two round parts circled in red called? There's one on the left and one on the right. I just want to be sure I know what I need to buy!

Yes, that's the rear differential.

The parts group you're needing is here:
https://www.moparpartsoverstock.com...mbly=1035820&ukey_make=1097&ukey_model=15959&modelYear=2012&ukey_category=22692

The bushings are items 2, 8, & 9 in the diagram below, but there are other parts that go along with them that may need replaced. You may want to print out a copy of the diagram and show it to your mechanic to make sure you're buying everything that's needed.

 

"It was my rear lower control arms."

Do you have a picture of this one?
I have the same noise in my car...

 

Diagram is below, rear lower control arms are #16. https://www.moparpartsoverstock.com...ke=1097&ukey_model=15959&modelYear=2009&ukey_category=22703&ukey_driveLine=9501

 

Thank you, Sandstone! Apologies as my expertise (since having a rear end that sounded like the Titanic creaking and sinking) is in suspension, not the driveline lol. Do I need to buy two of #2 for both the right and left side of the Heep? If this were you, would you just buy 1-13? The parts that I need (2, 8 & 9) are the most expensive on the list, obvs. Since the other parts are relatively inexpensive, is it worth spending the extra money to buy everything? Thank you, as always!

 

If it were me, I'd try to narrow it down to which parts are truly bad.

The differential is supposed to be able to move a little, so without seeing it, it's hard for me to say what parts need replaced.

#8 and #9 are on the right and left sides, #2 is on the back of the diff so you only need one of them.