It would be helpful if we knew what year and model Crossfire you have . . .

https://www.crossfireforum.org/forum...tml#post812689

If you end up finding that you have to replace the rear differential, I would suggest getting one from a salvage yard. Lots of them available (search on E-Bay for "Crossfire rear differential") with most priced well under $500.00. Just R&R and put in fresh fluid.