I too am confused,,, a differential, is by some known as the complete rear end,(housing,gears,yoke, and back cover),,, others call the diff, also known as the center section. a pumpkin is also everything together ready to install

like here. is a diff http://www.ebay.com/itm/2004-CHRYSLER-CROSSFIRE-2-A-T-DIFFERENTIAL-TRANSFER-CASE-REAR-TRANSMISSION-/231550500716?hash=item35e97c3f6c&vxp=mtr