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There's actually a few kits available, and factory junkyard options. Since the abs ring is in the diff anything for a 5x5.5 lug 9.25" jeep/dodge/chrysler/plymouth rear-end will work just need everything from the backing plates out(grab the brake line nuts too just incase). I believe the newer rams would be the easiest to source parts for.
As far as compatible parts go, the list is very short. The 9.25 rear end is made with a bunch of different track widths, so only the Dakota will fit on a Dakota since the Durango using independent rear suspension. The Durango uses the same disc hardware as the ram, but the bolt pattern on the axle housing is different between the disc and drum brakes, so again, will not fit. The next issue would be with the proportional valve inside the master brake cylinder. I'm using a mbc from a durango with discs and will make it work somehow - will need a reservoir from Durango and flexible brake lines as the ports are on the other side of the cylinder. With some drilling or welding I plan on making the rear backing plate work and will provide a how-to if I ever get the time. Interesting thing I found was that the discs on the rear are larger than the front.
There's an improvement to braking performance? Nobody told me that. I doing it because I want to and drums suck. There is no weight savings, no real improvement, no cost savings, just less ****ty hardware and they look better.
Agree, I cannot believe drum brakes are used on any modern vehicle anymore... But then again, this generation of Dakota seems to be a mashup of afterthoughts just to get a midsize out the door (after having this generation for the past 5 years I'm still partial to the 2002 I had).