Durango's 04 and up do not have a trac loc limited slip differential available as a available option. Instead they offer traction control that uses the ABS system as a available option. The LD stands for Light Duty.
Sorry to use the "clip" word. That is the common phase used for the Trac Lock keepers falling out on '02 and up models. It's a big problem with '02 and up Rams with the 9.25 LSD diff. I have a '02 which is out of warranty and am looking at least a $1,000 repair bill. That's with me soursing the parts myself and the labor to install the parts. Glad to hear the Duro has no LSD.
BTW, the 9.25 indeed uses C clips to retain the axle, or it does on Rams anyway. Bob